Nipple question

La-la

Hi, I know that we aren't doctors on here but I just wanna know if anybody else had this happen to them. Told I was laying down and my left nipple got cold and hard and I went to cover it with my hand to warm it up so it could go back down but when I touched it it felt bigger and now I'm freaked out I'm 15w6d today and I never had this happen until today and only with my left. It has went back down and it looks and feels normal again.