Avoiding pregnancy

Lately I have been terrified to have sex because of pregnancy, I have been with my husband 15 years we have 2 kids I have been on the same pill for 9 years, he wants more I do not! We don’t use condoms June 27th last time we had sex got my period July 17,18,19,20 then again August 13,14,15,16,17,18 super heavy I have no pregnancy symptoms but can help to worry every time I have to pee I’m going crazy I can’t even go to a store because I want to buy tests .. am I crazy does anyone else have a terrifying fear that makes them check all the time since October I have probably taken 20 tests :(