I’ve never missed a period! What is happening to me??

I’ve been ttc for a while now and I’ve missed my period by a week but keep getting BFNs. I have never missed a period so this is really strange. No added stress, no big changes, nothing. I have been feeling hungrier, more tired, I gained a lot of weight, have been having stomach problems, slight cramps, no bleeding at all, white creamy discharge. I should be around 14dpo and all of my home tests have been negative. What is going on with me? Can someone tell me what to do? I’m freaking out here!