I have been cramping for the past few days... can someone please help?

My husband and I have been TTC for the past 2 1/2 years without any luck. I started my period Feb. 16. I am not expecting to start again until about the 19th (I have a 30-33 day cycle). We BD the first two days of March before he left for his ignment in California. I ovulate 14 days before my next period. I didn't chart my BBT this time because I have been sick on and off over the past two weeks and the OPK showed a LH surge on the 4th. The same day of the surge... I had the stretchy CM (which I found a little odd). The next day... I had twinges on mainly my left side (and occasionally on my right). And for the past few days I have been cramping quite a bit on my right side with some extra discharge. Yesterday at work I started to get real bad backaches (which happened in my first pregnancy before I got a positive but it ended in a miscarriage). I am curious as to what is going on. I have already ovulated and it's too soon for implantation cramps. Anyone experience this before?