If you can't have DH there I would urge you to have someone as a birth partner if possible, or even better a doula.
As Scandy mentioned having someone there for practical support alone is great. You have no idea in advance how long you will be in and having someone to fetch magazines,drinks etc is very valuable. I had a very long 3 day induction followed by EMCS.
In the latter stages of labour I couldn't actually speak at all and off his own back (he doesn't usually display alot of initiative!) DH arranged for a different midwife as one we had was a complete cow, asked the consultant all the right questions and was basically able to be my spokesperson as well as just reassuring me and so on.
I really could not have got through it without him. I thought in advance he would just annoy me! His reward was that he got to hold dd for the first hour of her life whilst I was being stitched up and he will remember that forever.
If your DH might not be great with the actual coming out part then you might be ok for that part as I think by then alot of women are in a zone and focussing on the midwife. But you should def think about having him there for the earlier stages so he can help you.
Also try to make sure he understands your birth plan/preferences so that he can discuss things on your behalf and make decisions if necessary if you're not able to.
Dont mean to scare you just best to be prepared. I think that if someone did turn up alone then the mws would probably take extra special care of you.