Rhythmic soft kicks

Im currently 29 weeks and past few days sometimes once in a while (so far like only 2-3 times) i notice my baby kind of soft kick or little soft jerk in a very rhythmic pattern like a heartbeat for 5 - 10 mins or so around my middle tummy. At first i thought its hiccup, but previously when i experience baby hiccup, its quite a continuous hard kick like i can really feel and kind of hurts cs it kicks down below quite hard. Could this be hiccup too, just that hiccup can also be soft kicks and not always hard? Or something else. And this happen when i just woke up in the morning. Not after i eat something spicy. Kind of worried. But baby still moving well. #FTM #pleasehelp