I am so sick of looking at bfn, where is af?

I almost a week late (I will be tomarrow) and I have taken alot of pregnancy tests and all were bfn, I thought I ovulated on aug 30 since my last period was aug 17. I have been experienceing all the signs, acne, bloating, peeing alot, increased appetite,crampy feeling, mild nausea and sore . My lowere back also just started hurting yesturday. I am not sure whats going on and I can't call my doc till monday. I am frustrated and I just want a bfp or a perid so I can try again. Has anyone experienced this and gotten either a bfp or a really late period. and what are the symptoms of ectopic pregnancy? has anyone experienced this? Thanks