Can someone tell me a good site or healthy eating plan

I might be pregnant I mean today is my ovulation day and me and my partner had sex last night and few times today, I'm really working myself up about all of this I want to be a good mum and give my baby everything he/she needs I mean I may not even be pregnant but could someone tell me what a good eating plan is to keep my baby healthy (incase I am pregnant) at the moment my diet isn't that great :/