Confusion?

I’ve done some research and just about all websites say that you can’t have a regular period if you’re pregnant. There are some personal stories from people however I’ve seen that say that you can like that one famous tennis player’s. If you have protected sex (combination pill) around 5-7 days before your period and a couple times before that after your last period, and have a normal period (such as a more bright red color, somewhat heavy flow, and heavy cramping) is there ANY way you could be pregnant. I’m fully aware that chances are those personal stories are just about implantation bleeding but some say they got regular ones for months after becoming pregnant. Thanks I’m sure this is my stupid paranoia but I like conformation.