Late and negative=so confused 😫

This is my 5th late day with no AF. I took a home test this AM and it still came up negative. I take a medication to sleep every night (knlonopin, sp?) and I've read it can be dangerous to a baby so I went to the doctor (they also did a pee test that was negative) and they took blood work (which should come back tomorrow) but is it too soon for even blood work to be positive?
 My calculations would put a little over 4 weeks if I was carrying.. but everything has been negative.
Has anyone else been through this? What was the outcome??