Wondering if it's my birth control or pregnancy . Help!

[10flower10]

So I had unprotected sex about a week before my period was due , but it was only stuck in and out a couple of times. ( at this time I was not on birth control) then the following weekend my period came as usual and I had the most excruciating cramps I've ever had in my life and I noticed that the blood at first was pinkish , then turned red but it had almost like tissue pieces in it ( this period is when I started my birth control called cryselle) so I was worried but my period came so I thought maybe it was my uterus shedding. My periods are usually 7 days but this period ended up only being 2 days and like a morning of 3. This is when I started to freak out because my period then became this light brown discharge which I've heard can be implantation bleeding but my period was definitely red blood ... Just super short. During the next week my boobs have become so extremely sore and I've had mild cramping ... I don't know if these things that have happened is the birth control or if I am pregnant ?

[AnnieBrooke]

It's probably your birth control.  Take a pregnancy test once two weeks or more have elapsed from the unprotected sex to be sure.

[10flower10]

That's what I was thinking I just find it weird that my boobs became more sore after my period ended but it said it can be a symptom of the birth control