Dog is acting weird?

So I’ve got an 8 year old dachshund. Since he was a puppy he’s been very cuddly and loves to sleep snuggled up to me. However, when I got pregnant he began to sleep on his own, leaving whenever I tried to move him closer to me at night. I’m 25 weeks now and somethings changed, he just can NOT be close enough to me. At night he will sit and cry until I let him underneath the blanket to be right beside me, especially near my belly. If there’s no room for him he literally lays ON TOP of me which he has never ever done before. Has anybody else’s animals acted strange during pregnancy? I’m just so confused as to why he’s acting like this

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