Trying to get pregnant

Okay let me to by saying this. My last cycle was June 28,2020. I have not had an cycle at all in July. Okay not to mention that it is August. I was supposed to get my cycle august 1-4 but nothing. I have taken three test but they were negative. The test came from the dollar tree so I don’t know how accurate they are.

What should I do wait it out another week?

Buy another brand of test

Or just go to the doctor and get an blood test

Which brand of test should I buy ?