Aw mahal, don't worry, marami sa amin first timers na walang signs pa even a few days before labor, tapos bigla na lang! Ang labor ay iba-iba talaga per person, kaya depende sa'yo kung paano ka makakaramdam, pero usually may irregular contractions or cramping muna, tapos puwedeng may bloody show or gush of water. Best talaga is to stay in touch with your OB dahil siya ang makakasabi exactly what to watch for based sa iyong situation, at 39+ weeks na kayo, he/she might have tips na specific sa inyo pa lang. In the meantime, try to stay relaxed, eat light snacks, at kung may malalaking changes sa movements or pain, don't hesitate to call your doctor right away, ha! You're so close na, mama, you've got this!