Hello,
Welcome to ehealthforum and thanks for writing
There is absolutely no method for prevention of pregnancy by any home remedy.Only various contraceptive options available in different form are best prevention methods.
One way of pregnancy prevention is by following safe days in the cycles which are first and last seven days and unprotected intercourse can be performed during this time and the first day of cycle is counted as day one.
But this method is applicable for cycles which are very much regular of 28 or 30 days.
It is also not hundered perecnt safe and pregnancy chances are somewhat possible.
Kindly consider using any contraceptive options and discuss regarding these with the Gynaecologist.
Take care!