Baby movement ??

Abigail • First time Mom of Baby Girl Alexandra my Christmas baby 12-25-19 👶 🌈

I’m 18w6days so basically 19 weeks and I remember earlier on feeling my baby’s “thumps “ a little more frequent than I am now I’ve brought it up to my ob nurses and my ob herself but they’ve all said I have nothing to worry about. So there are times I feel a little “thumping” here and there but nothing too strong or intense and then go days without feeling anything at all should i be worried ??