Help!!! Need advice how did parents cope having a 15 yr old daughter pregnant

Jane
Hi need advice my 15 yr old told me she had sex. With her bf twice so cause she told me this I took her down the doctors.while waiting she admitted she has missed 2 periods but when got in doctors office she told doctor could be more as she can't remember when last time had one.she only started her periods not a yr yet I was so scared doctor asked her to do a wee sample and asked wot would she do if she is pregnant she said I don't no few mins later doctors said your pregnant so no need for the pill. 
She cried so much I cried I wanted to kill both of them we argued shouted at her but then I calmed down and said to her I was sorry shouting we talked as doctor told us had to make her mind up wot she wants to do so have to go back to doctors next morning we talked all day and most of night her stepfather support her with ever she wants to do and I told her same she came to me and said I'm keeping the baby then went bk doctors he felt her tummy said she is around 2-3 months could be more and she has a bump started to show but she is a thin girl I don't know we're to get help or advice I hear about my friends being like this but never ever thought I be having a 15 yr old having a baby she's my only daughter and my baby I have banned her bf from our house as I'm still angry In time I will let him over but his parents done same to my daughter. Iv looked into her schooling they said she can stay there till she's 6 months and do school online plus send paperwork home and she is going bk to school might put her bk a yr as she's in yr 11 taking exams I have said I will support her and help with baby while bk at school then she takes over as soon gets home iv told her how hard gonna be missing out going with friends seeing her bf everyday as she will have a lot growing up to do so has the father but he's younger then my daughter I feel bad like I have failed as a mother I told her about sex that not allowed to do that until 16 even then I won't allow happen in my house and she's the oldest she has 3 younger brothers  kids at school know now but there all supporting my daughter and said will help as she's one of the popular girls she thinks I'm gonna kick her out and keeps saying sorry I told her it was a stupid mistake can't turn it bk now we have to deal with it and get ready we just waiting from midwife and a scan to see how far she is now I like any other parents  advice if been in same thing or as say same boat and if I'm not only one going though this so hard to trust anyone with this secret my family all supporting my daughter but my exs family hate her and don't want nothing to do with my daughter they gave her a choice get rid of baby and have them in her life or keep it and they disown her and she's dead to them so crawl she said she can't kill a life a baby also says God has given her a gift  and she sorry wot has happen but no matter wot she done I was angry I will always love my daughter and help wot I can and support her