feeling depressed and suicidal during pregnancy

I've had depression for 10+ years and I was thrilled to be pregnant. I'm so grateful and I would never truly hurt my baby. But I had a very bad day and went to take my antidepressants and for a split second I pondered taking 10 of them, knowing I would harm myself and the baby and I didn't care. I don't know what to do. I'm already on meds, I'm starting prenatal therapy. Please I don't need judgement right now. I need support.