Is it just me???

So I'm almost 10 weeks but I keep questioning am I really pregnant??? I've had a sonogram and everything done but since I do not feel pregnant and have been having a lot of pain I keep thinking what if it's not there anymore and it makes me depressed and scares me and it doesn't help that my nausea is going away and that I've recently been diagnosed with E.coli :/ has anyone else ever felt this way? I mean felt not pregnant, nervous, scared or depressed??? Any suggestions s as to what I can do???