I've been thinking a lot bout my due date and when I conceived. I took a test the weekend I missed…

I've been thinking a lot bout my due date and when I conceived. I took a test the weekend I missed my period and the test came out negative. then I took another the following week it came out positive! I have an appointment the 25th and I'm going to have them do an ultrasound to check the growth. I'm guessing I'm due between August 16-23rd! praying for the 21st since its Hubby's birthday! :)