Prenatal depression

I’m 17+3 (1st pregnancy, and it was technically planned) and I’m starting to feel like I may have prenatal depression. There was sort of a shift in my mood 2-3 weeks ago, and it’s just been gradually getting worse it seems. I’m definitely going to get seen, for sure, but I was curious if anyone one else was dealing with this. And if so, about when did it start for you? Any answers are appreciated, whether it was a hormone imbalance or some sort of deficiency. Just wanted to know others’ experiences.