20 weeks. Only gained 4 kg so far and small bump..

Lynn
Anyone else finding it hard to get up off the ground when you're down even though you're not that big?? I work with children. I feel like i am twice the size getting up but im so small that really people look at my tummy with that look 'is she or isn't she?'.. also getting a sore back. How can you feel this way when you're still pretty tiny?? I don't understand. I'd understand if maybe i had a normal 5.month belly but i don't! !!