I stepped out of Oxford Circus tube into mid-morning crowds and cold, bright sunshine. The consultant's words were still ringing in my ears. "Nothing." How could the answer be nothing? This was January 2018, six months since my third miscarriage, a symptomless, rather businesslike affair, diagnosed at an early scan. The previous November, I'd undergone a series of investigations into possible reasons why I'd lost this baby and the two before it.

That morning, we had gone to discuss the results at the specialist NHS clinic we'd been referred to after officially joining the one in 100 couples who lose three or more pregnancies. I had barely removed my coat before the doctor started rattling off the things I had tested negative for: antiphospholipid antibodies, lupus anticoagulant, Factor V Leiden, prothrombin gene mutation.