Anyone experience this before?

My ovulation cycle ended yesterday and I'm due to start my period in 2 weeks, but my boobs are pretty sore. My boobs never get sore until I start my period, but even then it's not like this. My nipples stay hard 24/7 it seems right now. My back is aching a little and there's some slight cramping. A week ago I experienced light spotting but only for a day. I have been so constipated these last couple of weeks and can literally take a nap just about any where, anytime. I went golfing with my husband yesterday and fell asleep on the golf cart, even after 10 hours of sleep. It's too soon to take a pregnancy test right now, but is there a chance I could be pregnant?