Unprotected sex after stoppped birth control

I got my period on june 29 and started taking yasmin birth control pills on that date took them for about 10 days and stopped on july 8 on purpose I'm trying to conceive. I had unprotected sex on july 9, 10, 12 and I'm suppose to ovulate on day july 17. I started bleeding on 13 till now july 16 is there any possibility I could be pregnant. I bleeding has been light brown and a little bit red but mostly brown the bleeding lasted 4 days. Could I be pregnant