Hi Mr Justice, first i congratulate you & your wife for conceiving.
Your first query- Penicillin tablets and injections are safer during pregnancy and lactation, it can treat staphylococcal infection
, i think the discharge from vagina is due to candidiasis infection, it can be treated with local application(inside vagina) of clotrimazole or miconazole. Candidiasis wont affect your baby inside the womb.
2nd query- Staphylococcus infection
is not responsible for your premature ejaculation
. Seek Urologist