Could I be pregnant?

So I had unprotected sex on Sept. 4,17,18 he did not finish in me. Neither of those days were during my predicted “ovulation” days. I have been on this new birth control pill for around 2 months. I have not been experiencing any out of the ordinary symptoms beside some light brown/pink discharge on and off for about a week. This is usually normal on this pill right before my period but it is usually darker and heavier. I was supposed to start my period yesterday but still haven’t gotten it yet. I was also on an antibiotic cream during the first couple weeks of this pill pack and I was taking the cream on sept 4 when I had sex. I asked the doctor and she said it did not interfere with my birth control. Could I still be pregnant or just late period for some reason?