Mama, please see a doctor or go to the clinic ASAP, kahit paano, delayed period plus abdominal pain deserve a checkup para ma-peace of mind mo. Hindi ko kayang sabihin kung ano yan dahil maraming possibilities, pero ang importante talaga ay makita ka ng doctor para sure na okay ka at baby (if may baby), huwag mag-alala mag-isa. A few of us moms have been paranoid din before, pero once na-checkup kami, natulog kami ng mahimbing. You got this, and you're doing the right thing by asking. Saan closest clinic o hospital mo? Go na po ngayon para mapakali.