Can they miss it on chest Xray?

I went to the doctor and had a chest x ray and they didn't see anything and said it was a pulled muscle but the weird feelings I'm having on that side are just scaring me a bit. my mom told me to wait a week and then we'll go back. so, would they have missed it on the x ray? if so what then? and most importantly will i last a fucking week???

edit: side thought but it also hurts to press on my ribs there, is that the case for anyone else?