Ultra sound today

I've been doing blood work to keep a close eye on my pregnancy, because of my history of pregnancy. Did blood work on Monday and my numbers were 293 went back yesterday on Wednesday and it only went up to 350. So now going for. An ultrasound today in an hour and a half. I'm so emotional and worried. Levels are not doubling like they should, really doesnt feel like an ectopic. I'm in no pain at and having pregnancy symptoms like crazy. I have spotting but it's only tiny bit and pink in color.