is this sleep issue teething or the 6 month regression?

So we had a terrible 4 month sleep regression that lasted 7 whole weeks. It started at 15 weeks and didn't end until 22 weeks. She was up every 45 min to an hour. Well, my little girl just turned 25 weeks today and and the last four nights has not slept more than 20 min in her crib and 45 min in my bed. She is up constantly, cranky, screaming and tired. She cut her first tooth two weeks ago and has her second coming through. Is this teething or the next sleep regression? How long will this one last? My brain is mush. I'm so exhausted. Please ladies, any insight and suggestions would be soooo welcome. She won't take a binky, won't sleep in her swing and can't fit in her rock n play anymore. I'm at my whits end here.