Heartbeat and gender correlation

Di

I have a question for all you mommas that have had more than one baby. Did you notice that boys have lower heartbeats than girls? With my first son his heartbeat always lingered around 148 and with this baby I’m now 16 weeks and heartbeat is at 149 too I don’t find out the gender till Mid May but I’m just curious as to what your experiences are all like? Thanks ladies :)