Delayed biologic reaction?

Hi y’all! I took my first dose of tremfya 2 Sundays ago and didn’t feel any sort of “reaction” all last week which I thought was kind of odd. This last Sunday (exactly one week later) out of nowhere, I felt like I got hit by a bus. I figured I was just getting sick but the strangest thing is all the symptoms disappeared the next day. I’m wondering if my reaction was just delayed by a week? Has that happened to anyone else? The good news is I’ve gone from 5 down to 1 BMs a day so I think the tremfya is already starting to work!