Help?!

Ericka

So I’ve always had pretty irregular periods. But for the last 6 months or so they have been regular. Well, I was supposed to start on the 21st and I haven’t. I did have sex the day before my period if that changes anything?! I have taken 2 tests and the line was super faint. Was probably an evap. line. I guess I’m asking if anyone else has had this happen and ended up being pregnant?