It is a worry, I work at a uni too so am also lucky enough to get the 18 weeks full pay. Best thing to do is to look at where you can start cutting back now, and whack as much as poss into saving - you've got 35(ish) weeks' grace before you go onto the lower rate of pay which is nearly 9 months - even saving £100 a month will help towards that and you'll be surprised when you look hard at your outgoings what can be saved.
Things we've done:
- everything bought online goes through quidco.com so we get a little cashback
- got a joint account (we didn't have one before) for all bills, so we can see exactly what we've got and know what's in our current accounts is for spends
- start shopping online - you are less tempted to buy random things you spot, and if you meal plan you'll find you're spending a lot less each month on food
- checked the Sky package to see what can be cancelled
- accept any baby items, especially 'big' ones eg cots/cribs etc, that you are offered
- shop around for the rest - a lot of independent baby shops will price match so if you find a price online you can always see if your local shop will match it
- look at insurance, utilities etc and see if there are savings when you switch (may have to wait till contracts etc up but worth having a note of when this will be to remind you).
We've got a fair bit saved now and we haven't really compromised much on lifestyle, I know we could save a lot more if we wanted. Hope that helps a little bit.