I first felt flutters and involuntary twitches at 16 weeks. I'm now in my 18th week and I haven't felt the baby move the entire week. I'm starting to get paranoid. Friday I started to have terrible (I'm assuming) round ligament pain.. From my vaginal area to underneath my breast on the right side of my stomach. I don't have another ultrasound until June 7th when I find out the sex. I'm assuming if I'm just starting to feel the muscle pains.. Baby is fine?