Sexual desires since being pregnant!

Im so ashamed but every since about the third month of my pregnancy I've been having lesbian dreams. I've never felt so attracted to a woman in a sexual way. All I think about is going down on a woman. I do not want to have sex with my husband. I'd much rather watch lesbian porn and masterbate. 
Am I the only one? Is this infidelity? Please tell me I'm not alone 

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