Cramps

I'm having severe cramps and tomorrow is my last day of ovulation and I had sex everyday that I ovulated except last night and Tonite cuz my boyfriend has gone out of town. Could anybody give me any idea or suggestions on why I'm cramping so so bad to where I'm almost doubled over and plus I've been having some weird pains and twinges in my breast and along with sum really bad nausea. My nipples are also sore to. Any ideas of what's going on ladies