Gaining weight too fast!

I’m concerned I’m gaining way too quickly. I started off at an average weight with good tone (140 lbs, 5’4), and I’m currently 12 weeks 3 days pregnant, and I’m up 15 lbs :( Background info: I’ve been lifting weights and working out 5-6 days a week for over 3 years now. I have always had trouble losing weight- if I’m not strict, I can’t lose or maintain weight, it sucks. Anyways, I still workout out 4-5 days a week, this means: 30 minutes of cardio all of those days, I lift weights with a trainer twice a week, and take four half hour boot camp classes. Diet wise: I’m still strict with a meal plan Monday through Friday, and on weekends I give myself some snacks and a cheat meal. When I say “cheat meal,” I mean I’ll go to dinner, order a grilled chicken salad (no cheese, no dressing), then get a side of sweet potato fries to pick on, and this will usually turn into leftovers that will last the whole weekend. I don’t think I’m going overboard, but I’ve definitely been “indulging” more than I would of I wasn’t pregnant. Anyone have this issue? I’m very frustrated!!!