scared??

i’ve been on the shot for a month a half, and haven’t had my period since. i just randomly got it two days ago, and i had heavier cramps than usual, today i was changing my tampon and something large came out, it wasn’t a blood clot for sure, but it didn’t look very mucussy like most miscarriage pictures i’ve seen? i have a lot of anxiety and going to the doctor is a prime source of my anxiety. i’m not asking for a diagnosis, only opinions