My boobs went up a size all of a sudden! I’m producing milk again, my doctor says.Im not nurseing.

Patient: My boobs went up a size, all of a sudden. I’m producing milk again, but i’m not nurseing? Could I be pregnant.My doctor says my estrogen levels could be higher and my body thinks I need to make milk. Im confused cause i had a kid 3 years ago and nursed her untill 9 months and than my body stoped producing milk.. and now all of a sudden my bra goes up a size, and my prodcuing milk, im not leaking at all. I didn’t at all think I was producing again it was weird to find out. I’m not on birth control I use condoms. I’m pretty sure I’m not pregnant.