Sounds normal to me. Prochem can be a bit hit an miss with pip I have found.

If its not heated up it takes ages to go through a Blue but doable. I tried a Green last time to get a couple of ml in deep and the pain and swelling was terrible. Uncomfortable to walk even. Only lasts a couple of days but the last lot of PC I had done exactly the same. Does toake a few days to develop too. It's thick ole stuff and takes a while to disperse as had been said.

Unless its red and hot to touch I wouldn't worry too much about it.