Gemma Potter, 23, has repeatedly conceived despite using condoms, the pill, the coil, progesterone injections and an implant.

She and husband her Glenn, 27, now have three children - Shaun, four, Jessica, three, and Sophie, two - and have suffered two failed pregnancies.

They are now expecting their fourth child, despite only having had sex three times since September, because they were terrified that Mrs Potter would fall pregnant again.

She has accused doctors of not taking her seriously and refusing her requests for contraception that works.

Mrs Potter, of Plymouth, Devon, said: 'It has affected our sex life. I find it really hard to be intimate because I just keep thinking what if I get pregnant?

'You would think that being pregnant already would make it easier to have sex but I still feel worried.'