Anterior placenta question

I am 22 weeks pregnant and the doctor couldn’t hear the baby’s heartbeat loud with a Doppler. I had a ultrasound it was confirmed I have Anterior placenta. At 22 weeks I am just feeling the very first movement very low. I am small for 5 months. Last week I just had surgery because my appendix ruptured. Should I be concerned if my baby is small? Will i feel regular kicking with a Anterior placenta?