Hello and welcome to HCM,
I am afraid there are no home remedies to prevent contraception.
Emergency contraception involves some hormonal preparations.
But before even trying any contraception it is important to confirm whether conception has taken place or not.
It can be confirmed or ruled out by urine pregnancy test.
Urine pregnancy is a simple test which comes positive 10-14 days after conception.
Thus, pregnancy can be confirmed after 10-14 days only by this test.
If pregnancy comes out to be positive, again you will have to take medicine to abort.
Thus, it would be safer for you to take emergency contraception and follow up with urine pregnancy test.

Thanks and take care
Dr Shailja Puri

Welcome at HCM
I have gone through your query and being your physician I completely understand your health concerns.......
On which day of ur cycle u had sex? Has he ejaculated in vagina?
As far as chances of getting pregnant are concerned it is greater at 12 to 15 days of your menstrual cycle...
Contraception on the other hand , you should use it if you think there are chances of getting pregnant...there is no adverse effects on womb with positinor.
emergency contraception is there and you can use it next morning. as far as ur case is concernd i think there is need to find whether you have conceived or not You should consult your doctor for proper management....I don't think there us any homemade contraceptive....
if u have conceived then there are various ways to terminate the pregnancy. you can discuss it with your doctor
Have a nice time
Regards
Dr saad Sultan