Is something in there?

I am 17 weeks today and haven't gained, I'm not showing, and I haven't felt any symptoms other than occasional constipation and sore breasts. I constantly w9nder whether things are developing as they should and I won't have an ultrasound until week 20. Both of my friends who are due just a few weeks apart from me have had lots of tell-tale signs.

How have you ladies kept yourselves from going crazy wondering how things are progressing when you don't really feel pregnant?