Got a period after sex missed it the next month!

I last had sex oct 31st had a period 3 weeks later on expected date and it was heavy flow for 5 days . But now I’m 3 days late for my December period . We used a condom and pull out and he didn’t cum so I’m confused on how I would be . I felt fine for the past two months until missed period and now my body is under a lot of stress .