Yes! I had it at about 6 weeks pregnant with DS2 after I locked a number of my lower vertebrae together.
Remember to tell your osteopath that you are pregnant. Mine decided against using any of the ultrasound therapy he usually used and did all the manipulation with me lying on my side. It was wonderful and left me pain free for over a year (I have long standing back problems).
Good luck, and stop lifting chimney pots!!