HI, I am due for my period soon (this week or next) and my stomach is very stiff-like (And Bloated). ( I may have pulled some back muscles because they are a bit sore) Along with sore breasts and they seem to be a bit bigger. I took a Preg. Test just to be sure but it came back negative. Is this normal? or could the test be wrong? Don't think I am. Help? Im also under alot of stress.