AF is late.

So last month i had my period on the 24 and it ended on the 26th. No big deal with me. My boyfriend and I had sex the day it ended and a couple times after then we were having sex on the daily..(tmi) sorry. But now AF hasn't shown and I have taken a pregnancy test and still BFN. I been having un usual systomps that are not like the ones I have had before with my other periods... I took a test on October 21th and today. I am going to wait till Saturday to take another test. But what's going on...?