I don't believe so, quite the contrary. There's just something I know I'm missing that would be a huge problem. The idea is that a female character and her love interest have just physically bonded. Thorough the story, it's a whole misdirection case to make the readers think she's pregnant while she's not. Perhaps if the scenario was reversed? The male in the relationship is unordinary and when his mate isn't feeling well, he worries that he hurt her? Instead, she's actually pregnant and healthy.