Pregnancy symptom?

So my baby is 6 months and I'm bf, but I'm suddenly SUPER tired. Like could sleep all day and night and I'm spending all my time thinking about apples. I'm eating at least 1 a day but only cos I'm limiting myself. Is this bf related or pregnancy symptom? Its come on all of a sudden and I'm not on the pill anymore cos it was making me poorly (been off for 2 weeks) and yes we have and no we didn't (lol) x