Im 15dpo today my bbt was 98.76 yesterday and today af was due today but shes not here yet i feel her coming?

from time to time im a little scared to test my af always come at 15dpo maybe she will show later? i have alot of cramy cm and lower back pain on the left side above my hip and my breat are still sore they have been since 4dpo i really am hoping for a BFP!!! but scared to test because i dont want to see a BFN i cant handle another one 3 years ttc i took my 1st round of clomid in jan i did 4 rounds of clomid and 1 round of femara i ovulated on the femara and 3 round of clomid