Postpartum depression ???

My sweet girl is almost 11 weeks old. I have to feed formula for the first time yesterday since my husband spelt baby girls milk. I used to have some in the freezer for times like this but since I did have a little dip in supply a few weeks ago I had to use it. I only make enough for her to eat in a day. I’m really struggling with the fact that I had to give her formula for the first time it was never the plan. I also knew it was going to eventually come down to it as she started drinking more milk.Is this normal or am I struggling with postpartum depression? I cried almost all night about it.