Ay, this is something you really need to check with your doctor, lalo na kung may changes sa pattern mo, hindi ko dapat mag-guess dito! Pero real talk: irregular periods + negative PT tests can have different reasons (stress, hormonal changes, even just how our bodies work sometimes), at kailangan mo ng professional to figure out what's really happening sa iyo. Don't rely lang sa PT, go see your OB para sa proper check-up, okay? Mas peace of mind mo after.