Maybe my rainbow baby?

Alexis • Lost my pebble February 16, 2015. TTC baby #2
Hey ladies! Well I had a miscarrige in February at 8 weeks and 2 days. My fiance and started trying this month to conceive or rainbow. My expected period is on July 20th. I have 4 more days until af. About 2 days ago I've started to have really tender breast and have been really tired. I am so nervous to test. Should I wait until the 20th to test or what?