Help???

So i got my period a week early,(June 13th-16th) and it wasn't as dark and heavy as it usually is, but anyway, it ended on that Thursday, and I had unprotected sex on the 17th.. And then that following Sunday I went and pee'd and wiped and there was very very light pink stuff on the toilet paper, and on the 22nd I started puking and having really bad heartburn, and stomach cramps and today it was the same.. Is it too early to tell if I was pregnant? Or is these ovulation symptoms? Or what can it be?