Hello Sir.. I Had Sex Wid My Bf On 20

Hello sir.. i had sex wid my bf on 20 th feb n aftr dat night in the morning i took unwanted 72 my periods date was on 14 th feb n aftr takin pills i got bleeding aftr one week n now its 26th march yet my periods are not occuring n again i had sex wid him on 23rd march...frst widout precaution ge didnt ejacylated inside n aftr dat he took precaution ....so shoul i uv to worry ?