Cramps and sore breasts

Nescel

Hello! I missed my period last month and lately my breasts are getting sore or tender and been experiencing cramps on my pelvic area. It feels like period cramps but it only last for minutes. I really don't know what's happening to my body and I am still not able to have my check up due to tight schedule at school. My hands are really full bc it's our finals. Please can someone help me at this?