Aw, I totally get the worry, mommy! At 20 weeks, some babies are already very active while others take their sweet time, a few of my mum friends didn't feel consistent kicks until closer to 22-24 weeks, especially if you have an anterior placenta na parang barrier lang. But since you're at that milestone na, it's really best to mention it sa OB ninyo sa next check-up para mapigilan ang mind, okay? Walang bad in getting reassurance directly from your doctor, lalo na it will give you peace of mind. Hang in there, soon you'll be complaining na sobrang hirap ang kicks!