Starting to feel a bit despondant...currently 17.5 weeks with DC 2. Had positive 8wk and 12wk scans, and midwife heard the heartbeat at 15wks. But now it just feels like nothing. 
I felt movements at 18wks with DC1, really thought I'd have felt something by now? Placenta is not at the front, at least it wasn't at scan.
Is it always earlier that you feel movements with subsequent pregnancies?