Sleep regression?

My girl is now 17 weeks old. A few weeks ago we had a couple of nights where she would sleep 2-3 hours then was up every hour. Since then she doesn’t wake up but her sleep is very restless all night and she’s bringing her legs up in the air and rubbing her face. After her first feed in the morning she is shattered. Her day naps are a struggle. Her first nap of the day is the longest at 1-1.5 hour then every other nap she wakes after half an hour and I have to hopefully settle her back to sleep or she’ll be very grumpy. She only ever naps on me and her afternoon naps are a real struggle to get her to settle. Is this the regression?