It might be harder for you to conceive and you're at higher risk of developing gestational diabetes (diabetes during pregnancy
), high blood pressure, etc. But skinny women get those things too. You're just in a higher risk category.
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.