Does heartbeat meaning baby is growing?

I’ve been checking on my baby’s heartbeat at home since 11 weeks and my last OB appointment was at 9 weeks. The heartbeat is always above 150 beats a minute. Does the heartbeat for several weeks necessarily mean that baby is growing? Not healthy but growing. This will be my first living baby if everything goes okay and my 13 week ultrasound is on Monday. I’m very nervous that the baby isn’t going to be growing like it should or something else is going to be wrong.