Sleep regression?

My LO is about 6 1/2 months old, the week before she turned 6 months she was sleeping great. She would sleep 11pm-8am feed then go back to sleep till 10am. With a few naps durning the day. Right now I have no idea what happened to my baby?! She’s up till 1am some nights she up every other hour. Usually cries and the second I pick her up she’s happy and goes right back to sleep. She does have her two teeth popping thru but it doesn’t seem like it’s bothering her. Anyone going thru this?? And advice?