Brown uneven patch on edge of areola

I’m going to the doctor Thursday so I’ll be asking them anyways but has anyone else experienced this? I’m 33 weeks and tonight noticed a very uneven brown patch of skin on the bottom border of my areola. It extends outside of the areola a little bit. The nipple itself also has some buildup on it...maybe dried collustrum? Ughh I’m freaking out 😣