Why does this happiness to me

Stephanie
So I'm like 4 weeks pregnant havnt even gonna to call my doctor yet and today I start bleeding bad and I'm in alot of pain so I'm having a mc I feel like my body is giving up on me I already have 4 kids no problems threw the 9 months nothing and now with my new guy 2 chemicals and now this mc wtf is wrong idk what to do any more