Painful period

So I have the implant in my arm and now I’ve had my period 2/3 tines this month today it’s really bad it feels like someones pulling my ovaries out, it’s not that heavy today but I have blood clots. Usually I have heavy pefuods and get blood clots and pretty bad cramps. But when I got the injection I had no periods no cramps. I had sex the other day and after I notice a little bit of blood then a few hours later I got my period again. Someone help plz ? I’m terrified if I have endometriosis cuz I want tihave kids and I really don’t wanna have any surgery .