Huston...we have a problem

Hello. I am new to glow. I have a question that's for my best friend of 20 years. My friend and I come on around the same time(AF). Lately she has been coming on before me because I have been late. This month her AF was a couple days late. She has very heavy cycles to where she wears a tampon and a pad. This time her cycle wasn't heavy at all. Her boobs are never sore. Up until this cycle she just had. They last about 4 days. After 4 days...she has been spotting for 15 days now and she breaks out in these hives. Her AF is due to come in a couple weeks. I told her she could be pregnant. ...so we are playing the waiting game. Has this ever happened to anyone?