Quickening on & off

This is my first pregnancy & Im currently 18 weeks + and already felt baby’s movements and soft kicks everyday. Noted that gynae usually will ask to start counting kicks by 27 weeks or 3rd trimester. Since im still in 2nd trimester, is it normal that some days i feel alot of movement but some days i feel lesser movement? Like baby not as active as the day before? Should i be worried or as long as theres movement within that day? #pleasehelp #firstbaby #firstpreganancy