Alamak, jangan risau dulu sayang! My friend cakap masa dia 20 weeks pun sama, rasa on and off je, kadang rasa macam butterfly fluttering dalam perut, kadang macam muscle twitch sikit, and she said her doctor confirmed it's completely normal at this stage. Someone in my mum WhatsApp group also mentioned that first-time mums especially might not feel it as strongly yet, sebab apparently if you have an anterior placenta (placenta kat depan), it can "cushion" the kicks so rasa lagi soft, she only started feeling stronger, more consistent movements around week 24-25. My neighbour pula shared that her doctor told her formal kick counting usually only starts around week 28, so at 20 weeks memang tak perlu terlalu strict track lagi, just take note kalau you rasa any movement at all. That said, every mummy and every pregnancy is different, so it's always best to check terus with your own doctor or O&G specialist, especially if you feel worried, they can reassure you properly and check everything is okay.