I have only eaten a little in a day. I really have no appetite, will this affect the baby in my womb

I understand how worried you must be, but a day or two of eating less shouldn't harm the baby, though it's worth checking in with your PD or gynae just to be safe, especially if this is happening often. During pregnancy our appetites can be all over the place from hormones, nausea, or stress, so it's pretty normal to have days where you just can't eat much. The thing is, if it becomes a pattern or you're feeling unwell otherwise, definitely get it checked out because your doctor can give you proper advice based on what's going on with you.