Is a fetal heartbeat of 144bpm good for 9weeks 3 days gestation?

Yes, via ultrasound

you can also hear the heartbeat around 9 weeks with a 2-3 mhz fetal doppler, while most doc's don't bother trying until 10+ I know many many people who have had no issues with finding them around 8.5 weeks. I personally have found my children around 8 weeks 5 days (3 of them) with the 2 mhz hi bebe fetal doppler. a pillow under the hips and full bladder help a lot.