Sever constipation help

I’m new to GLP1 I took my first shot in the morning ,bathroom was normal all day, that night I woke up to severe bowel cramping for about an hour and passed a movement. Rest of the week was normal. Thought it was one time thing but the following week same thing happened, first day middle of the night.

Has anyone else experienced this? How did you plan ahead to prevent this? I haven’t taken a shot for a month now in fear of the weekly night issue.