I'm sorry that you're feeling so down

Sometimes I think it's just easier to pretend it's doomed and that we don't care than to try to hope. But it's a lot more fun when we let in some of that hope
The pain you're describing sounds like round ligament pain to me. It is a sharp pain that makes you stop in your tracks that usually happens when you move quickly... sneezing is a common thing to cause it. Everything I have read says that it usually doesn't happen in the first trimester, but I ALWAYS have round ligament pains very early in the first trimester. It sounds like a good sign to me!