Butt pressure- ?????

Maryann
Has anyone here who has been pregnant before experienced some of the following things? AF was due today but so far hasn't shown (fx it stays this way). I've been testing everyday and have just got bfns- every now and then I think I see a faint line but no one on here sees it. I ALwAYS get the same pms symptoms and I've had absolutely none of them. I have occasional pressure in my very low pelvis and my butt- weirdest feeling ever. I also get little twinges here and there. Any thoughts? Maybe it's just still too soon for a bfp? Could something else be going on?