Oh blimey this is me although I am not the mum talked about in the op.
I found out through school that my ds and his gf both 14 had started a sexual relationship even though I had spoken to him about her and said the obvious but it fell on deaf ears and there we were. I tried banning him from seeing her but he would just jump out the window and go and see her anywhere he could, word was they were having sex in the woods, friends houses whilst their parents were out, it was awful.
Dp gf N was a girl from a local traveller family (big community here, dp also part roma) and although a really lovely family seemed not to mind nor care whether her daughter was having underage sex. She said it was the norm in her family. She herself had been allowed to sleep with her bf at 12
.
Anyway, I was terrified this girl was going to get pregnant, her parents didnt really seem to mind and I certainly didnt want them doing it outside because of the risks. I went to the school and told them my concerns, they then informed social services who then informed the police. They all had a meeting and I was told that although both were 14 they would not take any action because they were both over 12, both had consented, knew the risks and took protection. I was utterly stunned at that, basically they were turning a blind eye.
School were rather stoical and told me they couldnt get upset about 2 14 yr olds having sex because they got year 7s worring about pregancy because they had older bf above 13.
So. I let ds continue in his relationship with N. Her mum took her to the doctors and she had the implant and the pill as she bled from it and ds went and bought condoms. They stayed at each others houses a lot but her mum and I agreed it was rather that we knew and supported them than them doing it in unsavoury places and risking pregnancy etc.
I have been judged. I know I will be here. I often think I should have handled it differently but I didnt. They are no longer together but my relationship with my ds is intact.