I hope you don't mind my posting in here, I am not a single mum and never have been, but if my sister or BFF came to me and told me she was preg I wouldn't dream of telling her to terminate.
There is no doubt in the world that parenthood is the most challenging thing you can do in life and I take my hat off to every single parent, be it mum or dad, for getting through it on their own, but I tell you it is the most rewarding thing you can do in life! Each and everyday you can be proud of yourself and your little person.
I personally would be going back to both your sister and BFF and tell them a termination is not an option, you are having your baby and would like their support regardless of what they feel about the situation or the father! If there is no luck there then I'd be looking for people who will support you and your decision because they are the people that are truely thinking about YOU!
I wish you all the very best with the road ahead, all the streghth to get through the hard days and hope your bub's father comes around soon.

Always remember we are all stronger than we realise, you'll suprise yourself with how strong you truely are and can get through anything thats thrown at you.

Oh and I believe if bub is 1 week gest. that makes you 3 weeks preg, still early on, but you've gotta start somewhere dear!