I took plan b after unprotected sex with my husband 2 1/2 weeks ago, exaclty on my most fertile day (didnt realize that until later). Had possibly breakthrough bleeding one week after that, one week before my expected period. Now I'm 5 days late of my scheduled period and have been having minor cramping (which i rarely if ever get regularly) and slight nausea. Whenever I did have any cramping before AF it only lasted one day tops! Any imput as to what could be causeing the cramping?