Was that movement?

I'm now 19 weeks and 2 days along. According to the books I've read and people I've talked to, I should be feeling Poppy's movement any day now. Someone told me-- and this makes perfect sense, whether it's medically accurate or not-- that all my movement during the day lulls the baby to sleep, so my best chance of feeling Poppy move (for the time being) is at night. I've laid in bed for the past few nights trying to decide if I feel anything. And then anything I do feel, I think, "is that just stomach discomfort? Gas? Am I even feeling anything?" I've become fairly nervous, though I'm not having any cramps or bleeding, and have continued to have pregnancy symptoms like the occasional morning sickness and ligament pain and swollen feet. We go to the doctor on Wednesday to find out the sex of the baby through an ultrasound, so at least I'll be able to find out soon if everything looks the way it should. I actually also have an appointment on Thursday, just for a regular check up. Should be a Kaiser-filled week.