8dpo symptoms?

Christine
Been TYc #2 for alittle over a year... finally had an LH positive on 10/14 we DTD 12, 14, 15 and 16 ... my progesterone was 15.19 on 10/20 ... since yesterday and today I have had some mild cramps and very irritable... took a free before and it was bfn... anyone else experience this? 
I'm thinking that I am out, any advice???