So can anyone work the working/child tax credits out for me so I'm coming out of work officially on…

So can anyone work the working/child tax credits out for me so I'm coming out of work officially on 26th August and so my maternity ends then too but I receive my last payment September as I get paid a month behind. So shouldn't I be entitled to more from the benefits as my partner will only be bringing in less than £14,000 a year once I lost my income so where does that leave me am I gonna be poor and when do I contact them about all this? They said the day after my maternity ends but I still receive wages after that in September then after that nothing? The benefit system is shit someone message me and help me out I'm confused! I'm gonna be ok aren't I?