A little bit of help

Hi i was just wondering if i could get a little bit of help. Im 10 weeks away from having my baby me and my partner have now decided to move in together he is on ESA at the moment as he has a hip dease and waiting on hip replacement we are in our 20s but was wondering how all this works would i get income support and he still would get ESA or we claim both and then i assume the money will be deducted from either the esa or income support i already have a six year old to so this will be my 2nd child but not sure how wr go about it all.. A little bit of help if any one knows would be much appriciated x