Please help !

My daughter has always slept in her own bed but now is sleeping on her own room, tonight is the first night. I thought it would go smoothly because she was good for a while. Well, WRONG! About five minutes after I settled into my own bed for the night with the cutest puppy dog face she walks into my room and says "mommy I want you". I wanted to shout I want you too baby. But, I had to put her back in her bed. Then she started to whine a little bit now she's quiet. It's taking everything in me to not go in the and cuddle up next to her! How did this go with any second time moms? How long did it take for your LO to get used to sleeping alone ? Please any stories would be helpful right now !