Fasting in the first trimester

A bit concerned about fasting in the first trimester. I'm currently 4w3d along, and I've been worrying if my little bean is getting enough nutritions to grow. Been asking my doctor friend, and she said I could continue as long as long I'm feeling healthy and not having symptoms of hypoglycemia. I have been feeling fine so far, just the normal thirst and hunger which one would naturally experience when fasting. But you know, one couldn't help but worry especially it's still so early. Pregnant ladies aren't obligated to fast in Ramadhan if there are health concerns, by the way. Just wanna know if anyone in the same boat and share you experiences. :)