My baby hasn't woken up to be fed?

She is 8 weeks old. Last feed she had was 9.30am to which she hardly had any (fell asleep) and before that had some at 6.30am. It's now quarter to 1 and still asleep (in a sling attached to me!). I've done all housework, hoovering etc and she slept through it all! She is fed. How often should she be feeding. Normally she is pretty regular. 8.30am, 10.30am, 12.30 am but has a break till about 4/5pm. The 7pm, 9pm, 11pm the about 3am and 6.30am. This is the approximate pattern she's had recently. Now, this break is confussing me!!! Is this OK?! :-)