UK mum help!

I'm having a real nightmare, I don't have a job and haven't since January (long story), I am 7 months pregnant and live with my boyfriend who is in full time employment and pays for his bills, my bills and our joint bills. To say money is tight is a struggle and we really could do with any help where we can get it so I have been looking to claim income support until I get back to work once baby is here. (Not something I am proud of as I have always earned my own money though I do not judge a single person who gets benefits). According to benefits calculators I have looked on I am entitled to absolutely NOTHING?? Is this right? I have zero income, no money coming into my bank account, nothing. I am purely living/getting by thanks to my boyfriend. It's not like we are married and I am entitled to anything of his and we could break up tomorrow, so how does his job affect anything I am entitled to? If I lived with my parents and was single I would be entitled to loads of things however I am not a liar - I am completely baffled as to how this is right??