Could it be a early sign of PG??

My s/o and I have been trying to conceive for a few months now and still nothing. Well I noticed maybe a week ago that my nipples are very sore. I took a pg test and it came back negative.  I have a 4 year old daughter. Who i breastfed for her first 10 days. And just let myself dry up on it own. So it took a while and I still had a little until a year ago. While tonight I start squeezing (because it's almost like an engorged feeling) to see if any fluid came out and on the left a milky like fluid came out. Not a lot but some. Along with a little cloudy clear fluid. And on the right cloudy clear fluid.