Help asap!!

I don't want to sound crazy since I'm looking on a forum to give me advice. I don't want to go to the hospital unless I have to. The past 2 hours I've had a sharp stabbing/crushing pain in my chest, shoulder hurts all the way down into my arm, and my upper back hurts. Plus i feel super tired. I tried laying down to go to sleep and it hurt to bad that it made me tear up. What is going on? Did I just pull something or what? I haven't lifted anything heavy is what I dont understand.

I'm also 12 weeks pregnant