working out while ttc

Elina
So me and my husband joined the gym. It was more for him as he's gained weight since his mom passed away. Me I'm really petite but I wouldn't say I'm healthy because I don't exercise on a normal basis.. we have a 16 month old and have been trying for a year for baby #2 my fertility doctor just started me on progesterone for after ovulation bc I have had 3 miscarriages.. 2 being in the last 6 months. My question is should I not start working out/lightly exercising? Is this going to mess my cycle up or stop us from conceiving since we already have problems..? Any insight would be nice.