18 wks 2nd pregnancy breast (milk?) "pain" normal?

I just gave birth 15 mo. ago - and breastfed for 3 months. I'm now 18 wks into my 2nd pregnancy, my breasts are hard inside LIKE they're full of milk and this morning when I woke up it felt like I'd been breastfeeding - a sort of tinging pins and needles "pain" - same pain I felt breastfeeding those 3 months. Anyone else have this? Is it normal?? I'd rather not have to call a doctor. Thanks!