i dunno if it makes you feel any better, but i've had to go to all my scans on my own, because my mum works full time and can't get enough time off and my OH always has work and can't get time off
but in a way it's nice cause you can ask anything you want

and not care about anyone thinking your stupid cause the midwives have had these questions millions of times before.. i also was scared as anything at my 12 week scan and ended up crying cause i thought soemthing was wrong with my bub.. but they got a nurse to explain everything to me.. which they wouldn't have probably done if i was with someone..
and also it sounds silly but you get to know before anyone else, and you get too tell everyone else the news.. which is quite fun!!
i'd also agree - tell the father of the baby.. you can tell him you don't want him to have anything to do with it if that's what you want, but if he does, then advise visits with you, that way your bub can't get rejected as much.. but you'll probably really need him to pay child support...
Oh and CONGRATULATIONS.. it's really hard, and sounds soo scary, but honest it's not, and you will meet loadsa people.. and people who turn their noses down at you, aren't lucky enough to be having your bubba!
xxxxxxxxxx
(sorry for the essay - hope i helped - feel free to PM me if you wanna chat or anything)