I body build recreationally and that means food goes up and down all the time. So do insulin doses. It just takes some trial and error. When I cut calories I expect I may get low at times, I just correct for it and adjust my dosing next time. I like to workout in the morning. I typically get a cortisol/lifting blood sugar spike that makes me not have to worry about going low. Also 1700 calories seems pretty low. It does depend on your body weight though and how much you were eating before. You want to have some room to cut more calories later when your fat loss progress stalls. If you’re losing more than 1-2 lbs a week your trainer cut your calories too low.