12 dpo cramp

Greer
Did anyone get 12dpo pains in lower stomach on one side and get bfp? Also running daytime temp in the mid 99's! Tested this morning bfn :( could it have been implantation...I'm on 35 day cycle today is day 35 so af should start tommorrow (deff no sign of her though can hardly even reach cervix, even though I know that's not always an indication) Any help would be great! Thank you!