Sex then period😒

Bailey • River James-Reid~ December 26th, 2018

So my boyfriend and I just finished having sex (amazing btw) and when I when to use the bathroom I was bleeding down there. I've never bleed from sex before. I am supposed to start my period tomorrow and it's always on time so could my sexual activities cause an early period? It's never happened to me before and I've had sex this close to starting and it was still on time.