Aw, congrats mama! At 12 weeks, ang belly mo ay maaaring wala pang obvious bump or medyo subtle lang, depende talaga sa body type mo at kung gaano kalaki ang uterus mo, lahat ng normal! A few of us mum friends, iba-iba kaming bumuo ng bump, some showed earlier, some later, so don't worry kung ang iyo ay hindi pa gaano visible. But since worried ka na, best to mention it to your OB sa next checkup para ma-assure ka talaga, kasi sila ang makakatulong sa specific concerns mo about your pregnancy. Hang in there, mama!