I got pregnant on the pill and didn't know, I carried on with the pill! will this of done harm to our baby?

2nd pregnancy, first was planned. Me and my husband didnt want any more kids for a bit so I went on the pill. I just found out I am pregnant and have been taking the pill as normal!! will this do any harm to our un born child? Also as Christmas has just been I was drinkin too and am worried in case this has done any harm!! I cant say exactly how far gone I am because i doubled up my pill packs so I wasn't on over Christmas! But I wud say roughly 6-8weeks.