What Are The Chances Of Pregnancy Having Blockage In Fallopian Tube?

HI MY IAM 32 YEAR MY MARRIAGE WAS ON MAY 2008 MY PREG RESULT WAS POSITIVE ON AUG 2008 AND MISCARRIAGE HAPPEND ON SEP 2008 (D&C DONEp)AND WE DIDNT SERIOUSLY TRYING FOR BABY FOR I YEAR.aND MY PERIODS WERE NOT REGULAR FOR 3-4 MONTHS IT WILL BE REGULAR AND AGAIN IT WILL HAPPEN AHFTER 45 DAYS GAP OR MORE THAN THAT.aND AFTER THAT I COULDNT CONCIEVE .WHEN I CONSULTED GYNEC THERE WAS A BLOCK IN FALLOPIAN TUBE AND THEY REMOVED BLOCK(OCTOBER 2010).IN THE MIDDLE OF THIS YEARS 2 TIMES FOLICULAR STUDY DONE.OVULATION WAS HAPPENING.aFTER REMOVING THIS BLOCK MY PERIODS BECAME AGAIN REGULAR.aND MY LAST MENSUS WAS ON fEB 5TH 2011.WHEN I CHECKED ON APRIL 2011 IT CONFIRMED THAT I WAS PREGNANT BUT THE SAME DAY BLEEDING STARTED AND IT GOT MISCARRIAGE(NO D&C DONE) I WANT TOI KNOW WHAT PRECAUTION SHOULD I TAKEN BOFORE GETTING PREGNANT NEXT TIME AND WHEN CAN I GET PREGNANT