Me and my boyfriend live together, so we have unprotected sex a lot. Im on the patch but when I was suppose to get my period it was lighter then usual. It was light brown then I bleed a little for two days then it was light brown again. So it lasted for 4 days, cramps weren't too bad, but then the next day I randomly woke up this morning and threw up. Ive been having a lot of headaches, and I feel like I could sleep forever.Could I be pregnant? Is it normal to bleed a little if I am?

Yes you could be pregnant, you could also have an infection, have a STD, or a dozen other reasons.

But yes a light period can happen esp if conception happened nearer the period time.

So wait about 2 weeks and do a urine pregnant test using the first urine of the morning