Traditional way is to start counting pa rin sa first day ng last period mo, regardless of cycle length. So around 4 wks 5 dys as of Jan 1. Yun ang EDD (estimated due date) mo via LMP (last menstrual period). Pwedeng maiba yan sa UTZ (ultrasound) kasi yun naman ay nakabase sa size ni baby. Either way, usually if first baby, pwede kang manganak 2 weeks before or after ng LMP EDD mo.
Frena Calicdan-Operaña