What Are The Chances Of Normal Pregnancy After An IVF?

Hi Doctor, am of 35 years weigh 85kg and been married for 10 years. i have PCOD. I conceived twins through IVF in 2012 but in 5 and a half month got aborted (delivered naturally and both were alive but couldn t survive). Reason could have been, i took stairs till first floor for few days.. maybe.... I was very depressed during these years and wasn t taking any medicine.. but now from this January itself i have started taking bigomet sr 500mg twice and APCOD obese once a day. wanted to ask after ivf can normal pregnancy happen and what are the chances.. also if i need to change my plan of medicine.. pls suggest