Talk to Gynecologist on Methods To Give Gap Amongst Babies

M a lactating mother, I want to ask is there any remedy to avoid pregnancy and also I want to use the pill right after intercourse as our ic routine is once or twice a month, still with condums but some time I feel like might be I get pregnant, so want to know is it safe to have the pill after ic and during breast feed is it safe? My baby is also taking some solid as well, plz help