Sub Drop Days later?

So, I (F) had a session with a Dom (M) on Saturday & another Dom (M) on Sunday. Both involved aftercare & cuddling. Yesterday, though, I started to feel real depressed. It was out of nowhere. I do have depression, so just assumed that was why. Today, it feels like all I want to do is sleep. Both sessions were amazing. I don't have a lot of real experience, but I do know that both times I was very safe and cared for. So I was just wondering if sub drop can happen days later? Is that a thing? Or is it just my body being a jerk? Any advice is helpful.
TIA