Never before pain

Hey everybody! I am a 21 year old and for the first time ever I am having really bad pain in my pelvic area. I've had some pressure and bloating before but never this achey pain. It feels sore and I don't even want to get up and walk. It doesn't hurt it is just very very uncomfortable. I am also having a lighter flow. I normally have a very heavy period and have to wear pads because it gets so bad. Any suggestions as to what might ease the pain or if it sounds like a should see a doctor would be greatly appreciated...Thanks!