Excited first-time mum-to-be

It ws on the 28th of December that I took a pregnancy test and saw 2 red lines. I was 7 days delayed, that time. I couldn't believe! It feels surreal! I broke the news to my husband, hours later and he would not believe me until he saw the PT. We are both so happy! I haven't gone to a doctor yet. And I'm a bit worried cause I had a sip of Coke on Christmas day, 3 days before I learnt about my pregnancy. I also ate kimchi. Should I really be worried about it? What tips could you give me, in terms of food to eat, what to do/not do, etc?