What Are The Chances Of Pregnancy When On Primolut?

I was on a vacation about 3 weeks ago. I used primolut for an entire week.. 3 tabs a day to stop my period. all the while was having unprotected sex with my husband. after I came back I stop took the pills. my period came(sort of).. it was not like normal. just little for 4 days.. is there any chance that I can get pregnant? If so will the babt be healthy?