Weird nipple changes??

Allie โ€ข ๐Ÿ‘ฆ๐Ÿผ๐Ÿ’™*๐Ÿ‘ถ๐Ÿผ๐Ÿ’™*and ๐Ÿ‘ถ๐Ÿผ๐Ÿ’• due in April

Ok this may be a weird question but has anyone developed yellow spots in the center of their nipples? Iโ€™m 17 weeks and I never had these before. I wonder if itโ€™s a hormonal change during pregnancy to prepare breasts for breastfeeding?