From the second i heard about this I haven't really entertained the thought of termination, i don't even really know why. Part of me thinks that if i can have PCOS, endometriosis and have used contraception, maybe this is meant to happen.
Oh babe you are so right! It definitely sounds like one of those 'meant to be' kind of events.
I would say tell both of the possible fathers - you have no need to feel guilt or shame - you're young and enjoying your life, so who cares about the nitty gritty. You used protection and your baby is an "unexpected but welcome surprise" (much nicer than "accident")... they may both run for the hills and that is fine but in terms of C/L assistance and CS later on you need to have exhausted all your options to know who the father is - something about reduced entitlement ... call them and ask about it all.

FWIW the one you have mentioned may surprise you... I was a young reckless drunk skunk But I know I am a fantastic mother and I am devoted to my DS's health and happiness. SO a r/ship with him is likely to be out of the realms of possibility but you may find that he shows more support than you think... is all I'm getting at in a round about way.

I can understand what you mean about not wanting to have this tangible idea of biological fathers support in your head, and that's fine, don't ever think of it like that, but morally how do you actually feel about not telling them? It's a big decision and only you can make it but have a think about it... you have plenty of time after all.

Lastly, you sound like YOU know YOU can do this... so it's all forward from here.