Could they be Braxton Hicks? Discharge will change in consistency and amounts so that is not to worry..as long as it is not amniotic fluid. At 21 weeks I had a leak and cramping pains and was put on bedrest...
I started to notice an increase of discharge when I was 29 weeks. I am now 31wks 1day. It was a LOT! The pains got worse as well. My midwife told me that everything was stretching out and getting ready for what's ahead. Last week I started experiencing pressure down there and can barely walk now because of it! Everything you mentioned sounds pretty normal, but if it helps to ease your mind, call you doc. =)
I'd call your doc, but it could be that your discharge has just increasethe it does the further along you get. and the pain could be ligament stretching. I had the stretching pain so badliy with both of my girls i would be doubled over in pain.