35 weeks is this normal?

so I had gained a little bit of weight at the very beginning of my pregnancy but then I was nauseous until 13 weeks and was throwing up until 20 weeks and of course that made me loose a lot. I was below my pre pregnancy weight (by maybe 4-5lbs) for a while and I was finally starting to go back up. I got up to 187 (started at 180) and I've been tracking my weight at my appointments. my appointments from March 16 to the 30th I had dropped 2 lbs and then from the 30th to April 6th (last friday) I dropped another 3lbs so I'm back down to 182. Which of course I'm not complaining in the least because with my first I gained 30 and never lost any of it and she's almost 3 now. But I just keep thinking about how I feel like losing 5 lbs in 3 weeks seems like a lot for someone who does absolutely no exercise and doesn't eat healthy in the least bit. my doctor hasn't said anything about it I don't know if she just hasn't notice or she's not worried about because I'm considered over weight for my height. My pregnancy measurements have always been right on track or a few weeks ahead. Just wondering if it's something I should be concerned about.