How dark/heavy is implantation bleeding?

[Newwife2018]

I'm a new wife and didn't have sex before marriage, so this is really new. Is this implantation bleeding? Is it dangerous if spotting like below lasts more than 3 days? Experie
My period is always regular, heavy and lasts 5-6 days, but this time it's way different. First day, spots of brown blood. Second day, pinkish, really light. Third day medium Flo, dark. Yesterday, almost nonexistent, brown spotting. Today, some pink then dark red spotting. Almost no clots this time.

Ive hard a highish temp, been really emotional, breasts kinda swollen, unusually high libido, etc.
I've been using spermicide during ovulation...don't believe in the pill and hubby don't like condoms.
However, I just need to know. Could I be having implantation bleeding?

[specialmom]

So, women don't really get many symptoms in earl pregnancy and that would not be the normal patter if a woman has implantation bleeding (most women don't have it and but if they do, it's a tinge of blood or light brief spotting).  You also could have out of sync hormones which causes all of those things too (think PMS, it's well known for those things and any change in hormones can cause those ambiguous symptoms).  
Take a test 2.5 weeks after your last unprotected sex or you can take one when your period normally would come.  If that's now, then take a test.  This just may be an irregular period.  However, now sure why someone wouldn't believe in the pill.  If you end up being irregular that may end up being the best bet to bump your cycle back to normal.  good luck