VERY late period. When to test? worried

My period was already 30 days late (yes I tested 5 times around the 20th day all were negative) before I even had unprotected sex. Then I had unprotected sex a week ago (still no period). He didn’t finish inside me, but I’m worried about pre cum. I took a plan B just in case but I’m over the weight limit by a lot, so I’m not sure if it’ll work. When should I test? Are the chances of getting pregnant for me high even though I haven’t had a period in over a month?

EDIT: Because people always talk about the things that weren’t asked. NO I don’t have unprotected sex, this was the first time and I just needed some help. I did not come on here to feel bad.