Random bleeding

My cycle doesn’t start til February 1st and my last cycle ended January 7th, but just right now I got up from the toilet and seen a drop of blood on the seat. I wiped and there was a generous amount of blood, usually the amount when I first get my period. I haven’t had intercourse or done anything out of the ordinary, but I have been going to the gym everyday for 2 weeks now. Could the gym be a reason or anything else I should consider?

Thanks!