I’m so irregular 😬

So I have a fwb that I hit up about 2 times a month. We use a condom every time and we check it before hand and after hand to make sure there’s no wholes and stuff but my anxiety gets me every month because I never know what day my period will start or if I’ll even have one that month because of how irregular it is! It’s so stressful! Are any of y’all like this as well?