Namaste Am 21 Yrs Unmaried Boy I Have A Girlfriend

Namaste am 21 yrs unmaried boy i have a girlfriend she is 19yrs old.we have physical relation from half a year.we use condom but still m afraid so we are planing to take sanghini injection so that we can be sure n safe.can you please tel me about doses,age to use and health problem that can be caused due to use of sanghini?is it right plan to use it?