really heavy af or mc???

it's been exactly two weeks since I had sex and I started my period a day early with very severe cramps and heavy bleeding. I have to change pass every hour as a tampon isn't even helping. I called out of work and stayed home b/c I can't even shower for bleeding everywhere. I don't have a history of heavy periods and this is borderline scary to me. I am ttc, I've never been pregnant and never had a this an mc or just a really heavy flow? I realize that none of you are doctors but based on your experiences what do you think?