TTC/Negative Tests

Daniela
Hi Ladies... So January was my first month TTC. I was supposed to get my period last Monday and still have not gotten it. I have taken four First Response Early Detection pregnancy tests and all came back negative. I am so excited yet so nervous to get a negative from a blood test. Should I call my doctor or wait it out a little longer? Should I continue to buy pregnancy tests or just wait for the blood test? Any advice is appreciated! Wishing you all the best!