Ay mama, based sa January 19 last period mo, most likely na-conceive ka around early February, kaya around that time ang due date mo would be late October! Hehe, pero the exact timing pa rin ay magiging clear once you have your first ultrasound kasi that's the most accurate way to date the pregnancy, lalo na ngayon pa lang, madaling malaki ang difference ng estimates. A few of us mums nandito sa community din had confusion sa ganitong calculation, pero trust the ultrasound findings talaga, mama!