My partner's not interested in since I fell pregnant 8 months ago?

It could be the whole your pregnant thing itself. Most men are really uneducated on how it all works, having while the woman is carrying a child. They really do think they can harm the baby somehow, or the child will see his or something ridiculous like that. It's a fear they have. One that needs to be sorted out right away. Also your drive has increased and his may have decreased for now. Men go through spurts during a woman's pregnancy like we do. He could also think your body is "off limits" now that you're carrying. Like that he once found appealing and y he might see them now as "the baby's". Doesn't really mean he's not attracted to you, just that things are a little different. Try spicing things up. Wear something y and surprise him if you're not already. Let him know it's ok and there's no harm to the baby during . If anything, baby loves the motion- rocking.