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Most entrepreneurs care deeply about their businesses but they’re not usually reduced to tears by a successful sale.

For Oriane Chausiaux, of Cambridge Temperature Concepts, which provides fertility monitoring for couples struggling to have a baby, the early successes of the business had as much emotional impact as financial.

“After the thirtieth pregnancy I managed to stop crying when I heard the news,” says Dr Chausiaux.

The company makes a monitor called DuoFertility. This is a small sensor worn by a woman under her armpit, which sends signals about body temperature and sleep patterns throughout the day and night to an analytics centre in Cambridge, using wireless technology. These signals build up a picture about when she is most fertile, because the presence of different hormones affects body temperature. Users can call up the centre at any time to discuss the results with a fertility expert.

The device is not cheap – it sells for about £500 in the UK, through the company’s website and Boots online, but includes all the analytics and communications with the company, which offers a...