My Last Period Was On 22.02.16 And Im Married And

My last period was on 22.02.16 and im married and i had sex on 9th march,11th and on 12th march, on 9th and 11th I took postinor but on 12th i didnot took any thing. and today is another 22nd but im not having my period, is there any chance of getting pregnant??thn i want to do medical abortion,plz give me advice.