Have you been paying class 2 ni contribs? If so then you will be entitled to full maternity allowance - £123 a week for 9 months. If not then you can still apply for MA but the level will depend on your earnings.
Hope the links work... I've copied this below as well:
What happens if you don't qualify for SMP? Maternity Allowance If you can't get SMP from your employer, you might get Maternity Allowance (MA) if you:
- are employed - are self-employed and pay Class 2 National Insurance (NI) contributions - have a Small Earnings Exception certificate - are not employed but have worked close to or during your pregnancy
The conditions are that you:
- have been employed or self-employed for at least 26 of the 66 weeks before the week your baby was due (a part week counts as a full week) - earned an average of £30 over any 13 of those 66 weeks
The standard rate of MA is £123.06 or 90 per cent of your average weekly earnings, whichever is less. MA is paid for up to 39 weeks; it is not liable to Income Tax or NI contributions.