Change in animals

My dog is a very independent dog and doesn't expect a lot. She rarely ever cuddles. I am 5 or 6 dpo and she's super cuddly. She won't leave my side and if my husband comes near me to even kiss me she starts barking and growling at him... Has anyone ever had this happen to them and end up pregnant? I know it's still really really early, but is it possible? 
Last month ended in chemical and she did not act like this!