Can someone help me or advice me please

Danna

So I started my period on Monday this week I only had it for two days on Wednesday morning went to change my pad and pee wipe myself saw it was brown but pee yellow instead of my period Tuesday had really bad crumps I never had so bad my crumps now today sat down waiting for my fiance to come home crumps started coming back again and my lower back was hurting still hurting