Late. Please.

One can’t be pregnant if they had sex two months ago, got their period last month (for 10 days with light bleeding, then heavy bleeding, then back to light) and is so far 3 days late for the next period right?

I’m just an extremely paranoid person I always think what if even though I’m positive I’m not.

I’m 3 days late but I usually get my period a week before or a week after the supposed date. I had sex in July but I got my period in August for 10 days straight. There’s no way right?