This will have much more weight if it came from a mum, but I have a few friends who were once in similar situations. They have not all done it alone, but they have done it all with an absent father (absent as doesn’t give a **** as opposed to separate but involved and supportive). You will find you are stronger and braver than you give yourself credit for and you will get through this.
If the father wants to be involved then he needs to support you right now an ethical perspective (I’m sure there are all sorts of legal red tape indicating they have rights regardless but this isn’t the focus right now if he has abandoned you), to not be there for you is to turn his back on his own child and is to his detriment and shame on him. If he wants nothing to do with you both now, dont make allowances for later. Make it clear that if this is how he sees it you will be focusing on you and your child and you will do whatever it takes to ensure you are both OK, and that might mean moving to where you have support for example. It really is a case of looking out for yourselves (you and your baby) at this critical time so make sure you focus on your health above a else. Hopefully a mum will contact you on here whose words can offer more support than mine but please stay strong and look after yourself. Get as much support as you possibly can and focus on those who give you support. For those that turn their back on you dont give them headspace, right now you need to focus on you and your baby.