hanelei
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I'm only 5 weeks and when I sleep on my tummy I feel something there. That scares me. But even if I lay on my back I still feel the something there. Probably the baby's sac?
That's more likely to be your uterus, which increases in size quite a lot during the first trimester. At 5 weeks your baby's sac is probably about an inch wide, so most likely you won't be feeling that yet.