I posted awhile ago about a possible ectopic pregnancy- and I'm still having problems. The gist is this:?

I have a 19 day cycle with a 7 day flow. My last period was August 22. As of Sept 10th, I missed my period. Before that I had common premenstrual symptoms so I was very surprised it never came. After this, I had the standard pregnancy symptoms: frequent urination, tenderness, morning sickness, dizzy, tired etc. I continue to still feel this way. However now, I have very strong cramping on both sides as well as a weird bloated section of my stomach underneath my ribs kind of shaped like a football. All pregnancy tests are still coming up negative. I've been taking progesterone for 7 days and was supposed to start my period again (if cycle was normal) yesterday. I have an ultrasound Wednesday and a statistic-based pregnancy test?? Any words of advice? Or has anyone else experienced this?