I live in the US so we don't use the same weight
system so I have no clue what 97kg is
. If you're concerned, try losing some weight
before trying. Adjust what you eat, how much, drop the caffeine, sodas, candy, etc. if you eat those things. Start drinking lots of water and fresh fruits and vegetables (as they are known to help with your fertility), and you can start taking a prenatal vitamin, too.
Get your body ready to carry a baby. Your baby will be just fine!