Hi Awkwardkitty, It doesn't sound to me like you are overthinking it. It sounds like you have a good grasp of the situation.
I don't have OCD but I have depression and anxiety and I turned to alcohol to stop the negative thoughts that were running around in my mind. As you know, alcohol appears to help very briefly. I found that it made things worse because, as you said, it adds another level of negativity.
Do you have mental health support now or was it just during your pregnancy?
I'm glad that you're back and working on your sobriety.