Hey I am in the same boat as you! I lost 30lbs and was in the best shape of my life and decided I was ready to get pregnant because I was just going to continue on doing ehat I did before..I worked out 4-56 times a week and now I can barely get 3 workouts in. I even made a schedule for a specific pregnancy workout I found on pinterest and walking and elliptical. We just have to listen to our bodies I guess! I felt Bette when I went to the doctor today because they told me to work out 3 maybe 4 days a week and only for a maximum 20 min..
My mw told me not to start anything new but to carry on exercising as long as I listen to my body. If im tired or feeling crappy don't force myself. My pilates instructor has told me to stop between 8 and 14 weeks.
I had this same conversation with my Dr and trainer. As long as your body temp. doesn't get to high it will not hurt the baby. It takes me longer to work out now due to the frequent breaks I take but I've found that it significantly helps my nausea and... constipation. Sorry if tmi . The most important thing is to listen to your body. Everyone's pregnancy is different so do what's best for you. Good luck!