There isn't much research on how much couples' habits alter as their chances of getting pregnant increase.

We looked at changes in a few behaviors over the course of trying to get pregnant in a South American preconception cohort study. Females between the ages of 21 and 45 who weren't undergoing fertility therapy qualified.Up to 12 months or until pregnancy, participants completed baseline and bimonthly follow-up surveys.

250 of the 3,339 females who had been trying to get pregnant for 0–1 cycles when they enrolled had given 12 months of follow-up without becoming pregnant.When behaviours were compared at 12 months to baseline, weighted for loss-to-follow-up, we found small-to-moderate decreases in mean caffeine intake (19.5 mg/day, CI = 32.7, 6.37), alcohol intake (0.85 drinks/week, CI = 1.28, 0.43), marijuana use (3.89 percentage points, CI = 7.33, 0.46), and vigorous exercise (0.68 hours/week, CI =Little changed in the mean levels of cigarette smoking (0.27 percentage points, CI = 1.58, 1.04), perceived stress scale score (0.04 units, CI = 0.77, 0.69), or other variables (such as consumption of sugar-sweetened soda, moderate exercise, frequency of sex acts, and multivitamin use), but there was some heterogeneity within subgroups.  (For instance, 14% reduced their smoking while none raised their smoking by more than 5 cigarettes per day; 31% increased and 32% lowered their perceived stress ratings by about 2 units.)

Even while many behaviours altered as pregnancy attempts lasted longer, mean changes tended to be small for the majority of variables.The usage of coffee, alcohol, marijuana, and techniques to increase the likelihood of conception were shown to differ the most from one another.