could the egg take more than 12days to implant? Because my ovulation was around 28th of novemeber i had unprotected sex and my period was due on the 13th of december, i had some pain and cramps i thought i was going to have my period but i did have them till now.alreday 5 days late.i had flu in between.i did a home pregnancy test and its negative. could anyone tell me why and is it possible that i am pregnant?