Hi mum, I had something similar around third trimester also, especially after sitting on the floor or getting up too fast. Sounds like your pelvis is getting strained from the extra weight and loosened joints, so try to avoid sitting low on the floor for long and take your time when standing up, like rolling to the side first before pushing up. A lot of mums also find relief with a pillow between the knees when sleeping and avoiding positions that make the pain worse. If it keeps getting more painful or affects walking, better mention it to your gynae or physio just to be safe.
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