Can Anyone Please Answer My Question

Okay I'm a run a whole description on what happened to me okay so on the 14 of this month September me and my boyfriend had sex and I noticed after we got up that I had some blood on the rag I wiped off with but I wasn't still bleeding none the day or night and today I was supposed to come on my AF today 16 but it hasn't came on yet since last month my period was knocked on lasted month on the 18 by my boyfriend so I think I wanna wait till the 18 to test or see if it a come on but I'm praying that it don't