18 weeks and still not sure about movement

I am 18wks and 1 day and a few times I swore a felt little pops on my lower right area but wasn't 100% sure. Is anyone else feeling or not feeling movement? I worry a lot because I had  a missed miscarriage at 16wks last pregnancy. We finally just went public with my pregnancy and also the gender (which is a boy) and our 9 year old is over the moon. Again it's constant worry like should I feel something, did I or is it too soon...thanks