Weight gain - Packing on the pounds

Help! Before 16 weeks I gained only 3 lbs. Ever since my 16 week appointment I've probably gained 6-7 lbs at least. I'm almost 19 weeks. I feel like for the past week I've packed on 1 lb per day. I can't keep going at the rate I'm going. I'll think I've done really well for a couple days eating wise and then the next day or two I will have gained another 2 lbs. Anyone have suggestions? Anyone else experiencing this?