>>519205111
Time her periods.
Usually you can tell when a woman is in heat by how wet she gets and the consistency of her pussy juice, but since you're both still children you'll have to use a calendar.
If she's regular, wait 10 days after her period starts before Nutting in her, starting right at 10 days will be more likely to give you a girl (slower swimmers with longer endurance), start closer to 2 weeks and you're more likely to get a boy (faster swimmers but don't last as long so better to give the egg time to get closer to the cervix.
If she's clotshotted, sorry buddy, but you're lucky you got the one. Both the disease and shots are the bioweapon, her being fully boosted and then getting reinfected give the spike proteins more chance to do their job: sterilization, especially women.
Shitty part is, it'll be congenital.