Hiii! At 35 weeks, it's actually possible na may slight dilation na, pero usually ang significant dilation starts closer to 40 weeks or when you're in active labor, bawat mama naman different, and honestly a few of my mum friends had dilation na detected weeks before their due date, so hindi unusual! Since you're a first-time mom, this is definitely something to bring up sa your OB sa next check-up, kasi they'll know best kung normal ba or if kailangan ng extra monitoring. Excited kayo na!