I have just started a new job after my SMP ending in January, I have also just realised that I am once again accidentally pregnant, what am I entitled to?

I have an 8 month old, I went on mat leave April last year and returned to work in January. Due to failing birth control I am pregnant again and very concerned about how I can support myself and my children. As far as I understand, I’m ineligible for SMP as I won’t have been working at my current workplace for long enough, but I also won’t be entitled to maternity allowance as I hadn’t been actively working before starting this current job. Would maternity allowance still apply as I was still technically employed? What should I do?