Nipple discharge.. Is this normal?

I got my period March 1st..everything seemed normal. About a week ago I noticed a cloudy liquid coming out of my left nipple. It happens whenever I squeeze or touch my breast. Both of my nipples are sensitive and my boobs are slightly sore. This morning, the discharge was still there but I also noticed a dull pain on my right side, sort of under my hip area. I'm also feverish, clammy, sort of crampy, tired, I have a headache and a little heart burn. I've checked online a few places and I'm not sure what this could be. I have been having unprotected sex for pretty much 5 years straight (with the same boyfriend) so I know pregnancy is a possibility, but should I be worried about cancer or anything else?