Late but not pregnant??

Soo I haven’t had a period since January, and I got that 1 after unprotected sex. I took plan b the next day & got my period like normal for January. Didn’t have a period in February, but since going of the pill last August/September, I also skipped Oct & December so February didn’t worry me. My period b4 being on the pill would skip months.

So my problem is that it’s now going to be 2months since my last period...so I took 2 test just to be sure. My app says I’m 43 days late so I just had to find out for myself.

So now what should I do?? Would it be okay to start bc this upcoming Sunday so I can start to regulate my periods again??