Help please

Hi all! This is my second pregnancy and I have so many questions. So far I only had one ultrasound it was at 15 weeks and I found out I was having a boy . This is my 2nd viable pregnancy and I had my son 8 months ago. Right now I’m current 21+3 weeks pregnant with another boy. I haven’t felt much movements or “kicks” . Since it’s my second pregnancy I thought I’d feel kicks and stuff earlier but I was wrong...still 21 weeks and 3 days and I feel little pops by my pelvis area. Would that be the baby and would it be normal to feel it in that area this far along? I’m so confused and my next appointment is on the 18th but he told me I wouldn’t have another ultrasound until at least 28+ weeks🤨. Is it normal to feel it in my pelvis area this far along for second time moms , and I haven’t had any bleeding or spotting at all. My last appointment was June 20th and the baby had a healthy heartbeat he said. please help T.I.A.