The 26-year-old actress, who starred as Polly in TV's The Camomile Lawn, has been told by doctors that her chances of getting pregnant are slim - the legacy of using the contraceptive coil as a teenager.
'I had an ectopic pregnancy when I was 19 and now I only have one functional tube.
'It was a huge shock when it happened, almost like a death, and it took me a long time to work things out of my system and come to terms with the loss.
'I was 16 when I went to my gynaecologist and asked to be fitted with a coil.
'It was wonderfully liberating, like the Pill in the Sixties.
'But I bitterly regret it now. Your body isn't prepared for an alien body to be put in it and it does mess things up.
'What is scary is there are so many women with similar problems, and I would warn anyone never to be fitted with a coil.
'Birth control is very important, but I'd never recommend it to anyone very young.'
Tara, who wants the coil banned, says it should not be prescribed to young women as it was so easily to her.
'When I was a teenager I never thought I'd want children.' she says. 'But now the right person has come along, I would eventually like to have a family.'
That person is Dorian Healy, 30, who plays Captain Keiran Voce in the ITV drama series Soldier,Soldier. They met on a night out with friends and Tara immediately knew she had found the man she wanted to marry.
Within three months she has moved into his two-bedroom flat in Barnes, South-West London, and last year he proposed while she was making the film Sirens with supermodel ElleMcPherson in Australia.
She hadn't had a relationship for three years until Dorian came along. 
'Yes there were men friends but none that I was really interested in,' says Tara, whose acting credits also include the hit film Hear My Song.
'We've had to put the wedding off until next year because Dorian's busy with Soldier, Soldier, and I've been filming a wartime mini-series, Fall From Grace, for Sky to commemorate the 50th anniversary of D-Day.'
Although Tara's own parents divorced when she was young, she says she is not cynical about marriage. 'In fact it is very important to me.'
'As an actress you have an incredibly shaky kind of lifestyle. You never know if you will suddenly be out of work. And marriage is a great antidote to that, it gives you a very secure base.
'When Dorian proposed I knew that getting married was the right thing to do, but if it doesn't work out then it doesn't work out. You cannot live your life worrying about what might or might not happen.
'So many people in this business meet on jobs, fall in love and then find they have got nothing incommon when they get back to the real world.
'But we met in a normal, real life situation, and had time to get to know each other before we had to deal with the separations which our work forces us into.
'One of the strengths of our relationship is that we are good friends.
'So many couples behave badly to each other. Yet they would never treat their friends like that, so why do it?
'I care very deeply for Dorian. We share the same sense of humour, the same outlook, and I value his judgement.
'Our telephone bills are enormous because we talk to each other every day no matter where we are.'
The couple will be relying on their strong bond to help them through if Tara is unable to have children. 
'I don't dwell on what might or might not happen,' she says. 'Dorian accepts we may not have a family of our own and if we have to adopt, then we will. The relationship with my own mother Sarah has always been close.
'She has always been there for me and I know that if I have a problem I only have to call her.
'The whole idea of motherhood is brilliant. If I have children I would want to take time out from my career to look after them. It would be a sacrifice worth making.
'I feel blessed that I've had so much career success since I left drama school four years ago, and have found a man I love.
'So if there are going to be problems as far as having children are concerned, then fine, I will have to accept it and learn to deal with it when the time comes.'