Stomach cramps

Vi

Hey girls I've been having stomach cramps this whole month and it's nothing like period cramps. Yesterday I was having pelvic pain on my left side. Today I was supposed to get my period and I have really bad stomach cramps and my back is killing me😩 I've haven't had my normal period symptoms though. I guess I'm just asking if this is normal or if I should be worried I've never had stomach cramps and have no idea what they are due to.