recently i have had laparoscopy surgery due to and ectopic pregnancy on oct.6 2011.after the surgery my hcg took until december to go back to normal. than i had a period dec 5 2011 and my next cycle was due in dec 30 and never came . iam now 11 days late on my period. i took a pregnancy test on jan 7 2012 which is 7 days after my period was due and it was negative . is there still a chance i mite be pregnant . if not what are the other reasons my period might be late