so I'm 13 dpo. I've had 3 vvfl positive tests. if I am pregnant (trying to verify tomorrow) I'm apparently almost 4 weeks? I feel like total crap! my back has ached pretty much my whole cycle but especially since ovulation, cramping, kinda sick to my stomach, very very very tired, just all.together run down. I don't remember feeling this awful with my other two. is this normal?