Fever n breastfeeding

So out of nowhere on our way home from a family bbq I get a massive headache, chills, body aches all over and 100.5 temp when I got home n checked. Right breast is a little tender but I chalked it up to wearing a wired bra for the first time in a a week lol I don’t see anywhere where I should not continue to breastfeed or anything but I’m not going to go to the ER or anything just ride it out till tomorrow n see how I feel I guess. Is this just from engorgement or do u think I’m getting mastitis..... never had an issue with my first.