Suggest Birth Control Measures While Taking Krimson 35

Hi doctor , Iam married and im having pocs problem, doctor advised me to take krimson 35 for 6 months for irregular period. i have already started now its only one month iam taking now. we had sex umprotected on 18 day of my period. i am bit worried will i get pregnant . im still taking krimson tablets. kindly advice.