I was picking my 2 year old up still right up to the day before my last c-section. I didn't pick her up anymore just for jollies though. I would pick her up because she wasn't listening somewhere like the play ground or because she was begging to be carried up to bed but if I could I'd make her walk by the end. Mostly because by then I'd be completely out of breath carrying her up the stairs or all the way across the play ground to the van ;-)
In other words, if it feels ok it probably is ok, if it doesn't then it's not.