Hay, I understand ang worry mo! So if regular ka talaga every 29 days, and nag-PT ka na na negative, baka too early lang, ideally dapat at least 12-14 days after ovulation para makita ang hCG, kaya best is mag-PT ka ulit after a few days if delayed pa rin ang period mo, or better yet consult your OB na para sure na. A few of us tried testing too early and got false negatives kaya frustrating talaga, but the timing really matters with pregnancy tests!