Still No Period.

Hi, everyone I just want to vent on here. Me and my husband have been ttc for almost 2 years and my last period was Jan 28 and lasted for 5 days. So it says I was suppose to start on Feb 28 and still no sign of period and it's a week late now. I've taken a couple of pregnancy test and came out NEGATIVE. I was really hoping to be pregnant I actually thought it was my month. I just feel so upset. HAS ANYONE EVER BEEN PREGNANT EVEN THOUGH YOU TESTED NEGATIVE THE FIRST WEEK?