How many hours in 24 does your baby sleep?

Recently (the last couple of days) my baby is sleeping a lot more - almost 20 hours in 24 per day. She’s eating well still and is alert when she is awake but before she would be more awake during the day. I often found she would fight naps though and was over tired. Should I worry about this increased sleep or not? I’m a FTM and a worrier!