Another ovulation question

I know this sounds silly, but I have two questions regarding ovulation, do you have to experience pains to know for sure that you're ovulating? I felt one side cramps the day before ovulation (yesterday) but I don't feel them as much today (just a small cramp on one side) . Another question is, is there certain foods I need to stay away while being fertile / ovulating? Will any certain foods destroy my chance of conception? Or is it safe to consume a majority of foods and drinks? Because I want to go out for lunch today but am afraid that what I eat, I will feel guilty and mess something up with my ovulation. Sorry, just double checking! I am a new mom so I may be asking a lot of questions.