No judgment here at all, but just for medical reasons, it might be prudent to plan on monogamy for both partners during the pregnancy, especially if you're herpes and hpv negative. Ultimately it's up to you what level of risk you're comfortable with, but STI infection during pregnancy can lead to complications during delivery (as with herpes) or preterm rupture of membranes during pregnancy. Hpv can also be more aggressive during pregnancy, which could put you at risk if you contract it.
Good luck with TTC!
M/C at 8 weeks -- May 2000. DS #1 -- March 2001. DS #2 -- November 2002. (Ten year break!) DD -- October 2011. M/C at 8 weeks -- May 2013. Expecting #4 late July.