how to ease my mind that i’m not pregnant

i’m on the pill and take it perfectly. i’ve had sex four times this month, but we also used condoms. I start my placebo pills this sunday and I just want to get my period. I don’t know why I get so worried that i’m pregnant all the time it’s so annoying. I have terrible anxiety and I know stress makes your period late but I just can’t help myself. I know i’m being safe so why the hell do I worry so much?! :(