From what I understand, it's very rare for complications to arise from HPV/genital warts when a woman is pregnant. Here's what this site has down in regards to genital warts and pregnancy:What about pregnancy and genital warts?
Most pregnant women who have had genital warts previously but no longer do would be unlikely to have any complications or problems during pregnancy or birth.
Most children are born healthy to women with a history of genital warts.
Because of hormone changes in the body during pregnancy, warts can grow in size and number, bleed, or, in extremely rare cases, make delivery harder.
Very rarely, babies exposed to the wart-types of HPV during birth may develop growths in the throat.
This so seldom happens, however, that women with genital warts do not typically need to have a cesarean-section delivery unless warts are blocking the birth canal. It is important that a pregnant woman notify her doctor or clinic if she or her partner(s) has had genital warts. This way they can determine if they need to treat the warts, or not, during the pregnancy.
I got that info here: http://www.ashastd.org/hpv/hpv_learn.cfm
in the genital warts questions & answers section.