Good Day! My Question Is About Pregnancy. I Had Been

Good Day! My question is about pregnancy. I had been taking contraceptive pills( 21 day pill) for more than 3 years continous. I stop taking pills last feb 18. I got my period feb 24. Today march 27, i still didn't have my period. We've been trying to have a baby, so were active sexually. Is it possible to get pregnant that fast after stopping the pills just last month? Is there any side effects of pills that can affect my baby due to long use of contraceptive? I'm just worried. What will you advise me? Thank you..