cramping and metal taste in mouth

I'm 37 and my parnter and i are try to have a baby.. Its are second time trying. But, this month has been weird for me. I ov on the 7th of Oct. but only had sex three day before that..Well on the 14th of Oct. i have been cramping on and off now for a week. I also have a weird taste of metal in my month. Is this happing to anyone else and is this normal. I think i might be pregnant but not sure yet....i Don,t want to take a test until i miss my mouthly with is the 24 of Oct.