I'm 13w today and I haven't gained a pound. Initially I lost and my Dr said that was okay because you "tend to make healthier choices" when you're pregnant so loss can be normal at first. But I stepped on the scale this morning and nothing has changed. Is that okay? I'm not freaking out or anything, just concerned that while baby is small, there's still a baby and placenta in there. Why am I not gaining? Do I need to eat more or will I just not start gaining a noticeable amount until later?