No.
Firstly it is not sex, it is just mating. Sex has the element of
excitement, some lust. This one has none of those.
Secondly, she might take you as her bf after the act. Then
headache for you.
Thirdly, she kena pregnant, how? Condom not 100% safe you
know.
Tell her you saving yourself for your wedding day. And she
should too
She for her wedding day lah, not yours.