Rose, I also had/have similar issues with high blood sugars. Around weeks 6-7, I seemed to have a lot of highs in the morning and afternoon, and I also felt like I could do nothing right to control them. I actually found that once they crept up I had no hope. If I could keep them manageable, I was ok. Since my bs started creeping as soon as I started my morning routine, I started giving myself a random 1 unit of insulin before showering. That would keep them in check until I made breakfast and hour or so later. Then, with breakfast (which is typically only 15-20 carbs), I would often give myself another extra unit of insulin on top of my I:C ratio.
Then I started having a lot of lows around weeks 10-12 (I think... I should have kept a diary). Then I felt like I was constantly sucking on juice boxes, and I also found that I needed a lot more juice to get my sugars back in check. Before I was pregnant, one glucose tab would raise me 20-30 points. Now I need at least 15 carbs to raise me 20-30 points.
However, now in my 13th week, I am now experience morning and afternoon highs again. I have resorted back to my random 1 unit of insulin before shower and with breakfast. I seem to have highs until 2-3pm, at which time I bottom out unless I eat about 10 free carbs. Then I have no problem controlling my bs for the rest of the night and I can eat a decent size dinner (up to 60 carbs).
I know that we are all individuals, but this is my experience so far, and I hope it makes you feel less alone in your battle for perfect control during pregnancy. I fight the same battle, with crazy emotions, but I have to say my weekly talks with my nurse (from endo office) are very helpful in both adjusting my insulin needs and reassuring me that I am doing well. Good luck to you!