Ay, I totally get your worry, girl, been there with the missed pills din! Based sa timing mo and na-negative ang PT, sounds like your OB ay reassuring you na, which is good, pero I understand the anxiety talaga especially pag delayed ang period, lalo na may contact pa. A few of us mum friends went through similar situations with pill adjustments and delayed periods from the hormonal changes pa lang, so it's not always a sign, pero since you're already concerned, just follow your OB's advice and retest on April 30 to be sure, okay? Hang in there, the waiting is the hardest part!