Sharp stomach pain

R
Does anyone get a sharp stomach pain that lasts only minutes right before their period? I've never had this before but this month I've been queezy with sore boobs, soooo warm, high bbt, so I've felt pregnant. But today I had this super sharp pain in my stomach and had really light coloured discharge 5 min later! Never had this before! 
​Anyone?
​I'm kind of scared!