Baby’s heartbeat is lower than usual is that ok

Mandy • 💏2012 🎀👶🏼1/10/14👼🏻+👼🏻+👼🏻+👼🏻2019👼🏻6/30/19,👼🏻5/31/20

Ok first off please no comments about how I shouldn’t use home heart Doppler’s. I have had a rough go at things we lost 4 baby’s since April of last year and then with this one I bled from 4-9 weeks. I’m now 13 weeks and seem be going good but I still worry a lot. I use my home Doppler every day to check up on him and his hb is always 160-170 but today it’s been 140-145 and it’s got me horrified cause I’ve also had some cramping and white and light yellowish discharge I’m so scared somethings wrong with him please help me ease my mind