I'm going through this too! I'm only 14 weeks so obviously not csrrying alot of weight yet but they say the hormones that soften joints or organs shifting can set it off. I get shooting pains down my butt and flank. Sometimes up my back too. Pain in the butt !
It's sciatic. Same thing happened to me yesterday
Ugh I'm so sorry I have the same problem and it's super annoying! The pain just stops me in my tracks sometimes.
Usually, I just gave to wait it out but a few tons that help me are:
-rubbing tiger balm on the affected area
-getting my partner to massage me for a little while
-resting/not laying on the problem side
-laying on my back, taking the knee of the affected side, and gently pulling it up and across my body towards my shoulder. All other stretches I've tried make it worse.
- whining lol
Last week I thought I was just having this pain, but noticed it was also in my inner thigh, my pelvic area and my stomach kept getting hard. Found it those ones were contractions and had to get a few shots at the hospital to stop me from going into labor.