How To Terminate Pregnancy Safely?

I am 30 year old women, since 1week I was having health issues like headache nausea n pain in lower abdomen, well the periods dates was crossed so I took medicine meprate later I I came to know that I was pregnant. 2 weeks ago when I had pregnancy test it was negative n now it was positive. Hence I am not ready for the baby nor my husband. Hence earlier also I had taken pills for abortion which was already 3 yrs back. So kindly help me what should I take the necessity n safe step for abortion which may not effect in future pregnancy. Thank you