PMS Nipple Changes?

I’m due for my period in the coming days and I’ve noticed that my nipples are darker. They’re also extremely bumpy too around them I guess where the areola is, which they usually aren’t. They are also very erect all the time now, and it’s not cause I’m cold (I know it’s winter). I’ve never noticed this or had this happen prior to my period. Is this normal? I imagine so due to hormone changes associated with periods but wanted to check. Thanks!