@Laura it's bad isn't it! It hurts to wall and I have to lift my 15 month old which isn't helping ha.
Whilst it's unlikely (and I don't mean to scare you), there's a chance it could be a DVT (clot in the back of the leg). Have a look at signs and symptoms on the NHS website and speak to your doctor/midwife if you're concerned.
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I have a similar pain, I think mine is related to my hip and glute pain, with tight muscles all down my leg then causing my tendons to be irritated. I’m going to see a physio to see if I can get sorted out, I can’t do this for another 15 weeks!