vaginapagina | period starting as the result of sex?

Is it possible for your period to start as the result of sex? I am visiting my boyfriend in NH and we haven't had sex since the end of May. We are both cis gendered and he is well endowed.

I have had bleeding as the result of sex before, especially after a period of abstinence, but I have used some rather large toys during that period, and had mild bleeding as a result - usually just a smear or two on toilet paper. This time it is steady, bright red blood, so much so that I need to use a cup.

I got my last period around the 29th of august and it lasted about 4.5 days. I hadn't had it since March previously. I had sex on Saturday night/early Sunday morning, had what I would have called normal post-sex spotting that night and into Sunday, then it got heavier Sunday night/monday morning.

Do you think that this period could be the result of good sex/orgasms? Or is it just my body being weird and trying to get on a cycle after being irregular since I went off the pill? Basically, can sex trigger an early period? Or is it just a coincidence?