Yes if Hibiscus Tea can cause a woman to be infertile while consuming the Hibiscus Tea.
So if you're trying to get pregnant and you're drinking Hibiscus Tea then you should cease consuming Hibiscus Tea during the time you're trying to become pregnant and during your pregnancy.
Drinking Hibiscus Tea while pregnant can cause problems with pregnancy and may cause harm to the fetus so it's recommended to stop drinking Hibiscus Tea while pregnant and while trying to get pregnant.
Around 15–30% of Hibiscus Tea is contains organic acid which affects fertility.