Burning boobs 🆘

Brittney
Yesterday while at work, I felt a really intense burning sensation in my left boob. I know sore boobs are a symptom of pregnancy but I had absolutely zero symptoms when pregnant with my daughter (granted this was almost 8 years ago) so this burning was very scary. It lasted a few minutes. I've been dealing with on-and-off sore nipples for the last week, never both at the same time though. Also experienced some very light pink spotting Tuesday, Wednesday and Thursday last week but only in the mornings. AF is due tomorrow, and got a BFN this morning. Help?!?