Is Conception Possible After Intercourse Despite Taking Primolut N?

hi, i met my boyfriend on 17th feb and was with him till 20th. my period date was 20th and my is a regular 28 days cycle. so to delay my periods i took promilut n from 13 to 22nd feb. i use to take the pill first thing in the morning . and i had sex with my boyfriend 5 -6 times in these 4 days. are there chances that i conceive and if yes then when can i take the test?