Please Help I Need Some Answers!!!!!?

Ok so my husband and I are ttc baby #2!! My last AF was on 01/02/10 so I think I ovulated around the 16th. We bd before during and after!! So yesterday around 230 pm I took one of those digital pregnancy tests and it showed up PREGNANT!!!! But then to night ten min ago I took one and it said not pregnant :( Im having a few pg symptoms sore , frequent peeing, little tired and very slight nausea?? So what do you guys think Im really sad.