How do I tell my mum I’ve had sex

So last week me and my boyfriend had sex for the first time. We have now been together for 6 months and we both felt that we were ready, he was also a virgin. I’m only 14 but my mum has had conversations with me in the past saying that she would support me if I did have sex just as long as I used protection (we used a condom) but all of those conversations were when she was drunk however I asked her in the morning if she remembers the conversation and she did. I’m scared that she will react completely differently to the way she said she would and might stop me seeing my boyfriend. What do I do... helllpppp x