So what do you guys think ??

1st day of last period was feb 11 lasted til morning of feb 14.. My cycles are every 35 days and always have been. I should have gotten AF on Tuesday, never got it so I took a test and it came back negative... It's now Friday, still no AF and I've been nauseous and had a headache all day!!! Want to test later but don't want to get my hopes up!!! AHHH cross your fingers