Spotting after unprotected sex. Am I pregnant?

[tulip162]

I recently had a UTI so I had sex unprotected on saturday night as I think I may be allergic to condoms. I'd taken my contraceptive pill that morning but forgot it on sunday and monday morning but on Monday evening I took both Sunday's and Monday's pill. I started bleeding on the same monday afternoon and today (tuesday) it still hasn't stopped. Could this be implantation bleeding as I had a period a week and a half before the unprotected sex? Am I pregnant? He took it out before he came but he may have came a little bit in me. I am so scared as I DO NOT want or need a baby. When is the earliest I can take a pregnancy test?

[tulip162]

I've had heavy - brownish- period like bleeding that is noticeable to say the least and I've had it for three days now. Does that sound like implantation bleeding?
I also haven't mentioned how I am verging on being anorexic - my diagnosis is still taking place and has been over months and I am very underweight. When I take my inactive pills , like last time (period), it took around 3 days for a very light period to start. This bleeding started very quickly and heavily which is why I'm extremely worried.
Thank you for the advice about condoms, I know it was very stupid not to use one! Do you also possibly know when the earliest is that I can take a test?

[Factorymomma]

Implantation bleeding is very light and doesn't last days.  Only 30% of pregnant women even notice it if they actually get it (most women don't even get it).  
if you were allergic to condoms (latex I'm assuming) you would be in a good amount of of pain.  You could have had a reaction to the lubricant on the condom which is more common.
If you forgot your "active" pills for a day and a half your body most likely geared up to have a period, like if you took your inactives.  
If you're still worried all you can really do is take a test.

[junebug19]

it posibally could be implantation bleeding, wait about a week in a half and take a test