Anyone noticing a pattern to their sickness?

Em

From week ten I’ve been vomiting (currently 11w 5d). Since my first day being sick, I’ve noticed that I will have four days where I hardly have any nausea and although tired, feel fine. But come the 5th day, I’m puking my guts up. This seems to have become a pattern. Has anyone else noticed something similar or is it more random?