Really Confused and can't get an answer

[Ballerina15]

Alright, so here's the deal.  Me and my boyfriend were having unprotected sex about 4 weeks ago.  The only birth control we were using was the pull out method (which really isnt that reliable...hence the post).  So anyways, all through that week I was getting these awful hot flashes at random times (that I am still getting now).  Me and him had sex the day after my period but I can not remember if it was December 22nd or 28th.  Starting January 9th, I was out at dinner when I got really sick, it was this awful wave of nausea that came from no where, it was terrible.  The nausea has continued on and off through out every day up until now (just not as severe).  On January 12th, I noticed that my breasts were extremely sore (which NEVER happens, not even during PMS.  So from January 10th to the 15th I had
~nausea
~upset stomach
~constipation
~bloating
~sore breasts
~headaches
~I was going to bed at 7 o'clock every night
~a terrible copper/metal taste in my mouth
~Hot flashes/flushing
~Back aches
~crying
~and some mild cramps

I tested for pregnancy on January 13th and got a negative
On the 15th of January, I got my period really late at night, but it was a lot lighter then usual.  After 1 1/2 days, it completely stopped and I was getting some brown discharge for 2 days but now it is completely gone which is very strange due to the fact that 99% of the time, I have an 8 day period with medium to heavy flow.  I thought I was getting a stomach virus, my lymph nodes were a little swollen, but that was gone the next morning.  
January 16-19th I had:
~Brown spotting and light period on and off
~Hot flashes
~Dizziness
~Headaches
~Copper/Metal taste
~Upset Stomach
~Constipation

On January 18th, I got a nose bleed for about 10 minutes then it went away
Yesterday, January 19th, I tested again with a Home Pregnancy Test that was also negative
As of today, my back aches, no more discharge, still slightly nauseous, flushing, very sad/depressed feeling (everything makes me want to cry), still having constipation, I am so bloated that I have trouble with my pants, and I have acid reflux (but that's chronic).  

So there is my super long story/symptoms.  PLEASE let me know if you think that I could be pregnant.  So far, both tests have been negative, but I may just not have enough HCG yet.  Comments or concerns on what could be causing this are greatly appreciated. :)  If you made it to the end of this, thank you so so much!

[AnnieBrooke]

Get a blood test from a doctor.  Their urine tests aren't any better than early-results tests that you can buy at the drugstore.  But if the symptoms are pregnancy symptoms, the doctor's blood tests will find it.  

[momof43]

Hello, I hope you are feeling better and I feel for you in your stress!

It sounds as if pregnancy is possible given your symptoms. I've had friends who showed negative tests even at 2 months pregnant, so that does happen. The spotting (brownish blood) could be your period, but is also normal in early pregnancies...you might want to see a Dr. as their tests are more accurate and they could tell if it's an ectopic pregnancy (which could also cause low HCG). I'm not trying to be scary, but it may give you peace of mind to know from a Doctor?

Best of luck to you! Hang in there,