Is there anything i should be drinking , eating , or consuming when ttc?!

Iam trying to become pregnant and what could benefit or harm my unborn child?...That's kind of my main concern. Plus I usually have a smoothie for breakfast with common ingredients but I do add flaxseed oil and protein powder usually soy protein...is that safe at any pregnancy stage? Iam type two diabetic.I'm not obese but iam about 10 pounds overweight for my height at the moment. Does anyone have any advice?