14 pounds at 17 weeks

I’m 17w 3d and have already gained 14 pounds. I was slightly overweight before pregnancy. My BMI was one point over into overweight. I’m 5’6” and started at 158 and am now 172. This seems like a lot of weight to have gained already and the majority of it was in first trimester. I should also mention this pregnancy started out as a twin (but then we found out we had an empty sac at 7 weeks) and my HCG levels were very high and that was causing me to want to eat a lot. I gained the most weight up until week 9 and then it leveled off. Most people I know haven’t even gained a pound up until this point. I also never had any nausea or morning sickness or any food aversions. Anyone in the same boat as me? I see my Ob this morning and will discuss with her. I was also bad in the beginning eating sweets etc. but I’m laying off them now. I worry about gestational diabetes. They say gaining weight too quickly isn’t good. Now it seems I’m gaining slowly and gained a pound this week.