Breastfeeding and teething

Felecia
My baby girl is 7 months and going strong with breastfeeding. She has 2 bottom teeth but that doesn't ever seem to be an issue with nursing. The first day they popped through she tried to bite but since then everything has been fine. Well I've noticed she is teething again and I can tell she's definitely trying to cut another tooth. This time is much harder on her for some reason though :( but I've also noticed one of my nipples has been extremely sore since yesterday morning. It's only happening with one of them but it is the one she tends to favor. It hurts so bad when she nurses I can barely stand it. It's not red and doesn't look out of the ordinary. Has anyone ever experienced this? This is my first so any insight would be great! Thanks!