opinions please!!!!

So I have a questions for y'all and tell me what you think... I have been trying to conceive for 3 months now well I have 2 children already . My oldest is 11 and she swears I am pregnant.. she has been telling me everyday for the past week that she knows I'm pregnant.. I keep telling her I'm not (it's too early for a hpt as I am only 6-7dpo) I just find this very strange that she is so insistent upon me being pregnant and I haven't even found anything out yet....