What Is The Best Medicine For Abortion?

y Hello sir I have 9 months baby now i had made sex enjoyment with my husband with few days before but i am sure that we did not transfer in b/w us..The problem is that my periods was extended my date was on 4th..two days was extended so i am was in tension..so pls tell me what to do now. I mind was telling now this not right time to pregnent for another baby..so tell me what kind medicine want take avoid this..