4 Month Sleep Regressions-4 Weeks In

Spoke with Dr, read some articles about baby 4 month sleep regressions, my LO is 18 wks, about 4 weeks in with regressions and her wake ups, fussiness, over-tiredness seem to be intensifying, never ending. Her temperament is usually awesome, no teeth yet, maybe going through a leap too? It’s been so hard that all naps happen in my arms, we’re consistently watching the time so she isn’t awake more than 1-1.5 hrs. White noise, dark room, wind downs with soothing music, pacifier, we do it all. Two nights ago, we decided to bring her into bed with us to temporarily improve quality of her sleep, afraid we’re sparking a bad habit. She’s too young/small for sleep training, per Dr. Any other suggestions? What are your experiences? Words of support are appreciated.