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Hi, I used to struggle with something very similar. I think in this situation it is okay to open up to her about how you feel regarding the situation (I have had this convo with my “non ocd” partner). I don’t currently drink and he does and I can feel weird about it sometimes but that’s a situation manageable with boundaries, what’s done is done and boundaries will help with future decisions surrounding this topic

It really doesn’t sound like you did anything wrong. 1. that is your partner so I’m assuming it’s a frequent occurrence, you’d remember vividly if she told you no or didn’t want to do something. 2. OCD wants you to believe you’re a bad person, and goes against your WORST FEARS. It does not make you those things if anything it makes you exactly the opposite, keep that in mind. 3. I would talk to her about your OCD and these feelings, explain it vulnerably and be open. The only way out of this is through and you will need that support.