Opinions??

I took an opk on October 27,2017 and it was positive. My husband and I BD the day before of and after, and then some. I had ANOTHER positive opk on October 31,2017. We also BD the day before of and after that. Today I starting feeling low abdominal cramping, and back cramping. My period is supposed to start next weekend, and I’ve never had any cramping more than 2 days before my period. I’m feeling lightheaded, and mildly nauseas with certain things. My nips are also VERY VERY SORE AND SENSITIVE AND TENDER. I know it’s too early to test, but is it possibly this is a good sign?!?! Has anyone else experienced this and then gotten a BFP?