Hypos are extremely common in pregnancy, so yes, it's normal
And yes, they are different - they can come on quickly, need more treatment and more top-up food, and it's not unusual to go low, treat, eat a snack, and still be low and need more treatment. They do start easing off around 18weeks or so (approx).
Sometimes I tested every 30 mins or even more often when I was going through lows in the morning. I also drank Lucozade, ate sweets and had snacks with no bolus with no effect on my BS! All normal.
Have you spoken to your DSN about a possible temporary reduction in your basal insulin? I'm on a pump so I can't make suggestions but I believe some ladies on MDI do have to,reduce their basal.
As for the nighttime low, I set my alarm every night, had Lucozade and ate a snack then.
My tips are to check about possible basal reduction, test as often as you need, keep hypo treatments everywhere, and have good, concentrated carby food top ups like flapjacks, cereal bars, bananas, etc.
You may also be able to reduce your meal ratios slightly but do check with your team first. Personally, I found it easier to just top up with snacks as needed.