Any ideas?

So I’m not on birth control and I’ve been pretty ignorant when it comes to condom use with my boyfriend. A week ago I got off of my period. But all of a sudden yesterday I started bleeding. It was light. I thought maybe implantation bleeding or ovulation bleeding. But implantation bleeding wouldn’t happen for about another week or so. So I settled on ovulation bleeding. But then today I noticed it was heavy like a period. But 3 weeks early . Do you think it’s still ovulation bleeding or did I have an early miscarriage maybe? I’ve been cramping a lot today.