Need help

So this month I had blood work drawn on cd 21 they said my progesterone level was a 2.8 and that leans them towards I didn't ovulate. 5 days later I was expecting my period either Tuesday on cd 27 or Saturday cd 31 but instead it came on Monday cd 26 and I have been feeling horrible ever since. I have really bad cramps and nausea but my period has still stayed fairly light. Normally my period is heavier and can fill a tampon over night easily but so far it's light and I haven't filled a tampon yet. Anyone have any idea what could be happening or have any advice for me?!