I had to completely cold turkey stop lunesta (eszopiclone) rotated with restoril, seroquel and trazadone. 4 wks Pregnant. How long do u think my insomnia will last?

Difficult to say. That is a very complex regimen for sleep and I am glad you are not taking any of these since you are pregnant. Restoring is the most likely of these to cause rebound insomnia, but it depends on how often you were taking each of them. Pregnancy itself can also affect sleep due to hormonal changes.