Hay, mama, ang dami mong symptoms na parang pregnancy talaga, ang discharge, cramps, dizziness, headaches, at antok ay common sa early pregnancy, pero ganyan din when your period is about to come kaya tricky talaga! Feb 19-23 is still quite early pa (around 3-4 weeks from your last period), so it's possible hindi pa enough hCG ang body mo to show on a PT, lalo na if your cycle is irregular. One of my mum friends did negative tests twice tapos positive na rin eventually, pero honestly, best na umiba ka ng test brand o pumunta ka sa OB para sa blood test na sure, kasi nakakaguluhan lang ang waiting game na yan! Let me know once you find out, and fingers crossed for you