Between 50-75% of sexually active men and women have an HPV infection at some time in their life. your partner can have it, but, because, in most cases HPV infection is without symptoms, he may not know.
Don't stress about how to talk with him about this.
This infection can be catch even if you very with only one partner, years ago.
Sometimes, body immune system appears to get rid of the infection, but, this may take months to years.

Pregnancy can cause genitals warts to grow at a fast rate and if they are situated in birth canal, will cause the birth canal to be blocked. They can, also, make urination difficult for the mother. So, when active genital warts are present in the birth canal, c-section is performed.
Sometimes, the virus is passed to the baby through delivery, leading to formation of warts in baby's mouth and throat.
This can be, also, avoided with c-section, cause the warts can be life-threatening for the baby (they are treatable)