I've been on the injection for 5 years. I'm a month late in getting my injection and I have not got my period yet. I have mild stomach pains and I'v had them for 2 weeks now. Is that normal?

Have you ever read the side effects for having this jab?? It can take months for your period to return some women don't get one for years.
I will also say if you are trying to conceive get ready for a long wait the stuff is plain evil yes it does its job real well but it puts the body into a pre menopausel state and it can take some time to recover.
Just a waiting game I'm afraid.