Gah! My 17.5 mo old son has not nursed for 24 hours!

Last night, he had a huge dinner so I chalked it up to him being full. But, this morning before I went to work, and even when he came home from his grandparents', and even at bedtime, he didn't want to nurse! I offered it to him, he latched but pulled away and said "no"!!!! Is this him weaning?!

The other day, he nursed but kept in latching and staring at my nipple and then would turn away and then repeat.

I'm not sure how I feel about it... I thought I was ready but it still makes me sad plus, he hates any kind of milk! But at least he loves yogurt!