Does frequent or seldom sex in late twenties / early thirties has an impact on the chances of getting pregnant in middle/late thirties?

A couple of recent studies have suggested, somewhat radically, that sex changes a woman’s immune system in ways that improve her chances of conceiving, maintains the overall fitness including mental health. But when it comes to your ability to get pregnant in your early 30s versus late 30s, As the decade progresses, fertility decreases significantly for most women. In your early 30s, your chances of getting pregnant are only slightly lower than in your late 20s, and your risk of having a miscarriage or a baby with Down syndrome is only slightly higher. But at 35, that decline in fertility begins to accelerate.