I really want some answers

Mirelys • 1 MC on Feb'14 and 1 Rainbow baby born on Feb'15❤️ TTC#2 and 🐶🐶
This is my first pregnancy and I am 4 months(17 weeks) and since like 2 days I've been felling that when I lay down in the bed at night that something starts moving for like 5-7 or more minutes and I want to know if it's my baby or something else.