Ok, this might be long but I'll try to keep it succinct, two very different stories here!
I was 14yo, about to turn 15. Had a relationship with 20 or 21yo man, can't remember exactly. My parents did not approve, his mum had died so only his elderly father for guidance on his part, and he didn't care much whatever. We were having sex (at his house) and an accidental pregnancy ensued. I still had a year of school left. My parents were obviously furious, they had been very strict with me about when I was allowed out/when he visited etc. and tried to stop us seeing one another. I'm sad to say I lied and did whatever I could to be with him anyway. They were talking about going to the police etc. once the pregnancy came to light, so I did stop seeing him as I didn't want any trouble (small town, everyone knows your business etc)
My parents begged and pleaded with me to terminate the pregnancy, my friends advised the same, as did wider family. My mother ended up using her small savings to pay for an abortion, as I was already 11 weeks and our GP had told her there was probably a few weeks wait for an NHS abortion. This was money she had saved for my sisters and I to learn to drive. Eventually my family came to accept what had happened, but it was clear they felt unable to trust my behaviour in the future. In the meantime I had endured all kinds of oddness from this 'man', who claimed the child of his I had 'killed' (his words) might have been the second coming of Christ
he was deathly serious, his words have not been taken out of context here!
Fast forward a year, and I'm 15 about to turn 16yo, meet a lovely man, who was aged 19yo about to turn 20. We started going out, my parents were very worried. Understandably! However we took it easy and grew together to finally marry and have 3 children, still together nearly 20 years later.
So to summarise - depends of the maturity of the two people involved, basically! I was too young the first time, and he was a dickhead. My parents were right and I will be eternally grateful to them for helping me get it of a situation I thought I was grown up enough to handle, when I wasn't. My mum did most of the talking and I didn't think she did it that well, too much of her own feelings were obvious and the way she approached some of it pushed the teenage me further away. They tried to discourage the second relationship with DH but quickly realised from experience what would happen if they came down to heavy on it, so I think they watched carefully from a distance.
Hope anyone looking for information about similar situations finds something useful in my post.