Aww congrats mama, first time mom talaga yung exciting at confusing feeling! So if irregular ang mens mo, mas better magpa-ultrasound around 8-10 weeks para makita niyo ng malinaw ang baby and makuha ng tama ang due date, kasi kung irregular, mahirap ma-calculate based sa LMP lang. A few of us mums with irregular cycles did the same, and it gave us peace of mind na lahat ay okay sa dating. Pero honestly, best to call your OB ASAP kasi siya ang magsasabi based sa test results and how your body is, they know best talaga! Excited ka na ba? Congrats ulit!