12dpo and cramping..

Marie
Has anyone had cramping like period cramping and still gotten a bfp?? I have been nauseous, extremely sore boobs and nipples, exhausted, dizzy, excessive saliva for about 5-6 days now. Tested yesterday morning but got a bfn and figured I would because it's kinda early to tell. Just don't know what's going on! I never feel like this prior to my period!