Severe cramping and clotting

Celeste

Woke up from severe cramping and pain. Had been spotting since last Wednesday period supposed to start this week app said Friday. Pants filled with flood (TMI) also when I peed I had more than usual blood clotting. I was in such pain I called my obgyn which she's seeing me in an hour. The pain comes and goes not as severe as this AM. But she wanted to see me to be safe, has anyone experienced this?