I haven't had my period in the last 6 months I was on the jab for 2 years and started havign periods again now I'm not having periods I took pregnancy tests they all come up negative is there something wrong with me?as I'm not able to become pregnant.

If you are not getting periods, then you are not ovulating. If you are not ovulating, then you can't get pregnant (because no egg will be released). That is why you aren't pregnant.

Talk to your doctor to find out why your periods have stopped, then he/she can help you.