I had sex with my partner on the 9Th of march I then took the morning after pill on the 12th as my little boy was ill on the saturday, I then went on the contraceptive pill and started to take this the following day, I then bled on the 23rd of march for about 3/4 days I thought this was due to the pill so stopped takin it. If that was my normal period I am now late on my period by a week and experiencing, cramping, backaches,boobs a little tender, and lightheaded, I have taken preganacy tests about 4 now and all come back neg wats goin on?