Niki8 on "Possible to have af before beta?"

I am 10 dpt today and have had on/off cramping starting at 4 dpt. Today, I have had a lot of cramping (like af is coming). I know if could be a good sign, but its freaking me out! Is it possible to have af arrive before my beta on Monday (13 dpt). I think I am going nuts here, but wanted to see if it has happened to anyone else. This is my third cyle and we transferred 4 eight cell embies! This has been my best cycle so far and I am scared to death!