Sorry to hear you're feeling so "messy" in your head. I know how you feel, I was diagnosed with OCD about a year ago, and the first few months of therapy I was making progress, but now I'm in a major relapse. Quite horrible, but I remind myself that I will make it through this and be satisfied, if not completely happy, with my life again.
Tell yourself the same thing: remind yourself every day that this is just a stressful time (I'm no doctor, but I think it's very probable that the hormones are making the OCD even more intense) and that eventually it'll be in the past. Repeat to yourself as a mantra that it's just the OCD thoughts, and not what you actually want to do. You sound like a perfectly nice person and I'm genuinely sorry that this stupid obsession is making you feel bad.
Don't forget that there are people all around you that can support you and help you. You mentionned your very supportive husband, for example. I have a family that loves me and tries really hard to help me too, though I don't often make it easy for them... Try not to feel bad about them; remember, if you need help from your loved ones, you can't be afraid to ask for it. You shouldn't feel bad or be afraid that you're somehow making their lives a bit more complicated too; if you're feeling a bit miserable, they're there for you. They want to help you because they love you, so don't worry about them too much; I know it doesn't sound like a really nice thing to say, lol, but if you're not happy or scared then you should just focus more on yourself for a little while, at least until this whole mess blows over. But I am sure of one thing: you are not a bad person, and, as you said, the fact that you worry over and hate those horrible thoughts is proof that you don't really want to do them (since they horrify and disgust you)! You will not hurt your daughter or anyone else, I'm sure of it.
I know it feels horrible too when you think you've finally gotten rid of one obsession and then something tiny and insignificant just triggers it up again and you feel like you're right back where you started. The only thing I can say there is: try to ignore the triggers, and find a healthy distraction. My therapist suggests any kind of physical exercise, if you can find the time to do it. Just tell yourself that it's not you, it's just your OCD. Believe me, keep doing that and you'll be fine.
Anyway, tried to help. I wish you the best of luck, and hope you get this rough patch as soon as possible!