Avatar universal

Is a negativity pregnancy test 16 days after unprotected sex accurate?

Me and my boyfriend unprotected sex 16 days ago. It was only for maybe two minutes and he never came inside of me. I am also on birth control but left it in my car a couple of times so I don’t know how effective it still is. About two days ago I started having what looked like brown discharge (implantation bleeding maybe). I took a test on Sunday, two tests yesterday and one test this morning and they were all negative. How accurate will the negative tests be if it was 14-16 days after sex where he never came inside of me and my birth control is probably still effective? I am on continuous birth control so my period is not due until a month and a half from now. I am not sure how long i should wait to test if i'm not supposed to get my period for another month and a half. Also, the birth control was only left in my car for a couple hours at a time when i left my purse in there. I HAVE taken it every day.
2 Responses
Sort by: Helpful Oldest Newest
134578 tn?1614729226
I don't think you are pregnant. What you are describing does not sound like implantation bleeding (which is largely an Internet myth anyway) and you took all your pills, and your pregnancy tests all came up negative. Short of a signed confirmation letter from God, you can hardly have a more sure profile of someone who is not pregnant.

Why are you running your pills onto such a long cycle? My guess is that your body is trying to tell you that it thinks you should have a period.

That said, having a little bit of bleeding
Helpful - 0
The reason why I am on a three month cycle is becuase it makes my periods lighter and because of other medical reasons. Would it still be accurate if it was only 16 days after sex?
134578 tn?1614729226
It depends on the test's sensitivity, but I would say it would even with a relatively insensitive test. I assume you followed the instructions and tested with concentrated urine (the box usually says to use first-morning urine). If you used an "early results" test you can trust the answer.

In your shoes, I'd take the blood as a hint it's time to have a period, and stop the active pills and take the placebo pills, and then begin the cycle all over again. You could talk to your doctor about it if all of this three-month stuff is being done on his or her recommendation. But if you are just doing it on your own, my point is that breakthrough bleeding is sort of a hint that it's time to give yourself a period.
Helpful - 0
I use the first response early detection ones (the three pack). I took one Sunday afternoon, one Monday morning, one Monday night and another Tuesday morning and they were all negative. I am not showing any other symptoms either. The brown blood just got me worried so i took the tests. I'm just not sure if i should have waited a little longer to take the tests.

In regards to the birth control, I have really painful periods so that was the reason why i switched to the continuous birth control. I am really not looking into switching back because i don't want the painful periods again.
I'm also not sure if leaving my birth control in the car for a couple of hours would have done anything to the pills causing them to be ineffective.
I think you should talk to your doctor about using three months' worth of pills to avoid periods. Women's bodies are supposed to clean themselves out every month. Painful periods can be dealt with by anti-prostaglandins (even Advil, which is an anti-prostaglandin). They're caused by the muscles cramping up, and Advil is great at releasing that cramping. You'd be surprised, if you haven't tried it.

Anyway, originally (where I said "That said, having a little bit of bleeding") I was also going to advise you that you might not be protected, from the bleeding forward.  As the instructions say, if you have breakthrough bleeding while on the pill, assume you are no longer protected that month, stop taking it and let a period happen, and then re-start. And/or talk to your doctor. (*Are* you under a doctor's direct care, or is this three-month plan just something you decided to do yourself?)

Again, this is not meant to say that it sounds like you are pregnant -- you took all those tests and your bleeding does not sound like it indicates implantation. In fact, if I had to guess what happened, I'd think your natural swings of progesterone created in your own body went through the natural cycle and dropped (as they do every month in order to give you a period and clean out your old uterine lining) and if you hadn't been on the pill you would have had a period. But the fact that there was bleeding does to some extent suggest that your pill isn't superseding the hormone work that your body does naturally, which might mean your prescription needs to be adjusted to a pill with higher hormone levels. (If, that is, your doctor is aboard with this three-month-at-a-time plan you are doing. If not, give yourself a period and see if you can make it through with Advil, then start again.)

Breakthrough bleeding on the pill can mean the hormone dose of that kind of pill is too light for you, or in your case, too light to go three months at a time. And if so, sometime in the future, doing three-month runs might come back to bite you, as you might ovulate at mid-month if the hormone dose is too light. So, take it seriously as a comment on how your particular pill works (or doesn't) when used a particular way, and if you have any more sex before resolving the question of a higher-dose prescription versus going back to monthly use, be sure to use condoms.

As for the question of whether a pill getting hot makes it less effective, I doubt it, but you should call the pill manufacturer's 800 number and ask, or ask a pharmacist.

Have an Answer?

You are reading content posted in the Women's Health Community

Didn't find the answer you were looking for?
Ask a question
Popular Resources
STDs can't be transmitted by casual contact, like hugging or touching.
Syphilis is an STD that is transmitted by oral, genital and anal sex.
Normal vaginal discharge varies in color, smell, texture and amount.
Bumps in the genital area might be STDs, but are usually not serious.
Chlamydia, an STI, often has no symptoms, but must be treated.
From skin changes to weight loss to unusual bleeding, here are 15 cancer warning signs that women tend to ignore.