You wouldn't be menstruating while pregnant, and endometriosis sometimes clears up during pregnancy, so...I think you're going to have to wait for a diagnosis (from a doctor, not the web) until after the kid is born.
Dysmenorrhea - everyone gets pain during menstruation and you wont have that of you are pregnant
Endometriosis common in women with infertility so it is unlikely you will have this if you are pregnant.