Symptom question- 23 weeks

Hi. I’m 23 and a half weeks. For the last month I’ve been experiencing episodes of a really “thumpy” heart beat. Idk how else to describe it. Almost like palpitations when my anxiety gets bad, but it only for about 30 seconds. It coincides with what I think are Braxton Hicks?

I will get a crampy/ tightening feeling in my pelvis (sometimes it will get a little firm but not always). And that’s when I feel a slight rush to my chest, and will have about 30 seconds of that thumping heart beat.

I don’t think the actually heart rate is increasing, it just feels more pronounced.

This is my second- I remember Braxton Hicks with my first but never the palpitations with it.