My partner previously had issues with drinking which caused us to break up but we've been back together a few months now and he hasn't drank around me since. I've been away for a week and he's meeting me off the bus tomorrow but when I called him I could tell he'd been drinking. Before, he used to stay up all night drinking and would still act like an asshole the next day so this is what I'm worried about. I'm almost 4 months pregnant and can't be bothered with this but I'm not sure if I'm overreacting since this is a rare situation now?

I messaged him telling him how I feel and I thought we were past this drama but he said he hasn't drank that much and he's going to bed but he sounded quite drunk on the phone and didn't seem like he was off to bed...