My Period Started On The 2nd Of July This Year

My period started on the 2nd of July this year and ended on the 7th. I started taking combination birth control pills on the 24th. On the 30th my boyfriend and I had sex but we used a condom since I knew I just started the pill. Ive been taken them correctly ever since I got them. My period was supposed to come Aug 2nd but didn't. Could the pill have stopped my period or and I'm pregnant? I'm really worried.