Is 138BPM a healthy heartbeat?

Dee • 31, SAHM🤷🏻, Bibliophile📖, Foodie🍕🍔🍟, Sitcomholic🤣, Potterhead☇
Hello all! I'm just back home from an ultrasound at 13 weeks 3 days. My baby was active and everything looked good. What concerned me was the heartrate.. My ultrasound at 11 weeks was 144BPM. And now it's 138BPM... Is it a healthy number??? Please advice!