Aw normal lang yan, mama! Loose bowel movement from Yakult is very common kaya walang alalahanin, the probiotics talaga ayaffect ng tummy mo, lalo na kapag first time mo uminom or nag-adjust pa lang ang system mo. A few of my mum friends nag-experience din nito during pregnancy, and it passed after a day or two once their bodies got used to it, kaya just drink plenty of water and you'll be fine! If it keeps happening or may other symptoms, better check with your OB lang para peace of mind mo. Take care, mama!