Hi Angela
Sorry to hear about your mum, its still early days for you and your bound to be feeling sad about a lot of things but i'm sure your mum would want you to be happy and content and i'm sure that once you start your family you'll have lots of special memories of your mum that you can share with your children.
I once had a friend in a similar position and she started a memory box of her mum, old photo's, mums favourite songs on cd, lace hankerchief, favourite book, wedding ring etc, so she could share them with her children as they grew up.................i know its not the same, but its a nice thought.
Love Alex x