Need your help. So please help sir, mam.

Sir,mam The thing is that me and my wife don't want any babies for next 2 years...We are taking every precautions that could not let this happen...But still my wife don't get any period this month and feeling a bit scared... So I wanted to ask you is there any safe procedure that if my wife got pregnent but we can take care of that... I've heard that there is some procedure that you can do it in the first three months...But I also heard that It has side effects also...That's why I need your help...Me and my wife both are wanted to become parents but after 2 years...Because she is having her BTC course and I don't want her to take this responsibility now...I want her to compete her study first... So please help sir,mam.