Ay, alam ko na stressful yan! It's definitely possible to be pregnant with low hCG levels, lalo na if you ovulate later than expected, a few of us had delayed positive results kasi late ovulation kami, pero with only one ovary, your cycles might be a bit different din, which could affect timing. Honestly, after 2 missed periods I'd really suggest going to your OB para mag-blood test na lang para sa hCG levels instead of relying on PT, kasi yan talaga ang most accurate way, especially sa situation mo na may medical history. Rooting for you, wishing you get clarity soon!