Can people who have sex changes (male to female) get erections? And if so, do erections and intercourse feel the same as it would for someone who was born male and still identifies as male?

What is ectopic pregnancy? I saw it listed as one of the possible risks with Plan B.

I am positive I have a malformed vagina and it makes me very self conscious. I have enlarged asymmetrical labia minor folds which do not protrude the beginning half of my vagina, but do on the latter half and obscure my vaginal opening. This extra flesh is brown in color and not a healthy pink color.
Will this interfere with my ability to have intercourse later on? Is this in fact a "malformation" or is this "type" of labia not as uncommon as I think it is? Should I have labiaplasty?

Misc. semi pertinent facts:
I'm in my late teens, but not yet an adult and a virgin.