Started spotting and scared

Jessie
Started spotting pink tonight, right in the middle of our house warming party. So scared. Having anxiety attacks. Back had been sore all day and a pain in my tummy area just before it and for rest of evening. It's slowed down n almost nothing now on wiping...but belly hurts. I've had 3 mc already so I petrified. I'm just about to hit 5wk. 
Hoping I'm Ok when I wake up and it's just some IB as I've had that 'burrowing in' dull ache all day. Never had IB before tho.
Feel sick with worry but trying to remain calm. If it persists tomorrow I'm going to the hospital. If it's a mc I know there's nothing they can do, which is why I didn't race off. Too early to even see anything on a scan anyway I imagine. 
Heart is just thumping in chest, was so unbearable pretending to smile n shit to get through housewarming.