Sleeping problem!

So we had so many problems with our daughters sleeping, as right from birth she would only sleep twice a day for 30 minutes then at 6 months old it went down to 15 minutes and then she would wake every hour during the night and be awake from 2am-4am every night too.

It was exhausting, but finally at 13 months old she randomly slept through the night and then that was it, done it every night 7:30pm-8:30am. We dont even know what changed but we were so happy.

This meant we started trying for a baby after she had been sleeping well for a few weeks, because we were putting it off until she was in a good settled routine.

She is now 15 months and I found out I was pregnant 3 weeks ago, I am now 6 weeks pregnant.

From about a week after finding out, our lovely daughter has decided to go back to her old ways. She wakes up every 1-2 hours all night every night and takes at least 20 mins to get her back to sleep.

I am pregnant, hormonal and tired.

Shes not waking up for anything because as soon as im in her room she stops crying and just lays there staring at me doing nothing but will cry if i go to leave again.

The tiredness is killing me and I dont want it to be like this with 2 babies.