I was searching on the internet for Quranic ayat numbers for which sajda is wajib, but the website gave the whole verses in English and I randomly recited few words before I realised that it was the ayats translated into English, is sajdah wajib upon me to do now?

There is no Sajdah if anyone recites Translation. Also if you have randomly started reciting Ayah which has wajib sajdah and then you realized that its wajib sajda ayah now you have to do sajdah and if you have not do qadha later.