Hi, Michelle, and welcome! Flares can last a few days to many months! I've had some last as long as six months but, when I have a flare, I try not to dwell on it too much. I know it will get better eventually and I hope it will be the next day. That's how I keep going. Thinking about the pain and worrying about it will only make the pain worse.
Fertility issues don't seem to be a problem. Many on here have children and I have three, myself. I have never had spotting due to fibro, either. You said you went to your doctor. I think I'd find another doctor. It isn't normal to be spotting, in my humble opinion. I'm not a doctor but I know I'd see a gynocologist just to be sure.
Be sure to check out the Fibro 101 thread...the first thread on the forum. There are links to good info about fibromyalgia, including a list of symptoms, and I think you will learn a lot. The more you learn about this illness, the better you will be able to control it and have a full and enjoyable life with fibro.
I'm so glad that you found us and joined in! I hope to hear more from you soon.