18 and pregnant, food help ?

im 18 and pregnant am i a high risk pregnancy ?? do i need to eat certain food with certain amount of calories ?? this is what i ate today (im 8 and half weeks pregnant). i had egg mayo sandwich in brown bread cake, packet of salt and vinegar McCoy's crisps, 2 dairylea dunkers,3 chicken croutons with mash potato and carrots, and a crumpet with jam ?? is this to much and the wrong food. i have had 4 pints of water and did a 2 mile walk ?? many thanks! x