Hello, :) need some help?

Hello, im looking for some advice im 23years old married the last week i been experiencing heavy cramping like am about to start my cycle and i also have had this really sharp pain shoot into my breast where i have to stop everything im doing, my period is very very irregular one month i get next month i dont and so on, so i decided to take a test last night (first response) a very dark line came up so i figured negative but as i went to throw it away i seen a faint pink like start to develop ? so i waited few hours and took and other one same thing happened, but today i decided to take another test and only one line? im really confused on whats going on and a little bit obsessing over it any advice would be really appreciated