Breast milk coming back in ???

I’m 4 months PP. I haven’t pumped/breastfed since October- I was drying out quickly and was becoming very stressed, so I decided to exclusively formula feed. II stopped feeling engorged, stopped leaking and stopped feeling pain.

But last week, my nipples started to hurt so bad. Super tender to the touch, as if I was in my first trimester again. When I sleep on my stomach, I do feel pain in both breasts and my normal bras are uncomfortable again. I don’t think I’m pregnant because hubby and I have been using protection. My cycle is scheduled to start today, so let’s see what happens 😅

I’m addition, a few days ago, when I went to use the bathroom in the middle of the night, I saw stains on my night gown at the nipple area. My right nipple especially has a dry substance. It looked yellowish. So I’m like… colostrum? Lol.

Anyways, last night, I used my cooling gel pads with some nipple cream to help with the sore and dryness.

My question is, is it possible for my milk to come back in? Should I try BF/pumping ? I also plan to call my OB.