So I had sex on August 16, but the condom broke. I took Plan B on August 17 because that was the soonest I could get to a drugstore. Later that day I started what I thought was my period because it was heavy and red for about a day then went to being hardly anything for a couple more days. My actual period was supposed to come on the 23rd or 24th and it's now September 7th but it still hasn't come. Am I pregnant or is it just because of the Plan B pill??