Working and in pain

Caron
I'm 5wks+3 i work in a supermarket and I think I over done it last night with stretching. I had a mc in sept last year. I'm so worried about this pregnancy. I've got a lg who's 4 and she can't wait to be a sister. Do you think I should go and have a early scan to make sure. I'm praying it's not a ectopic pregnancy