Does anyone here get tender nipples?

Last night I noticed when getting undressed that my nipples were tender. I wouldn't say sore- just tender to touch. It's definitely not pregnancy related, but I'm hoping that it may be a sign of ovulation? They are still tender today. I've been on metformin for about a month now and had heaps of EWCM on Tuesday and Wednesday. After that I couldn't tell if it was EWCM or seminal fluid (sorry for TMI )

it may be ovulation. Can anyone shed any light?