and they are much more sensitive, always hard.

What's going on?

Maybe it means is starting working. I remember my nipples got harder and more sensitive too. For growth you have to wait some weeks but it depends on dosage and how sensitive you are with it. Remember to take Calcium together with PM or in a couple weeks you will feel really bad with weakness.
Good luck with PM!

and they are much more sensitive, always hard.

What's going on?

How long have you been on p.m. and what is your regiment intake?

Was taking BO for about a month, but even with Thyroid glandular, my basal temp was still 97.5.  However, during and after a workout, I could feel my nipples hurt and feeling in breast area (when I broke out a sweat).

Been trying PM for about 2 weeks, just under a teaspoon(ish) per 50 kilos per day, in AM.