Wa'alaikumassalam sis! Ohhh I understand lah, rasa macam pelik kan bila perut turun tapi sebenarnya pregnant. Honestly, this needs to be checked by your doctor or midwife ASAP, okay? Could be many things, positioning baby, ligament stretching, or something else, tapi they need to scan and confirm proper. A few of us mums in the group pun pernah keliru with weird tummy feelings, so don't worry lah, but jangan delay the check-up ya. Get it confirmed fast!