I am 29 weeks pregnant with my second child. If she has "dropped" already should I be worried?

I have been very busy the last couple of weeks moving into a new house and I've been very tired. I feel like now the baby has dropped down into my pelvic area. I keep getting sharp twinges down low and a lot of pressure if I stand too long. I also feel her kicking/punching and hiccups in my pelvic region. Does this mean I could go into preterm labor? Should I call my doctor or wait till my next scheduled appointment?