How far along am I ?

Nicole • Have a beautiful 1.5 year old boy 👶🏻 February 6th 2018👼🏻 . Twin boys due April/may 2019🌈🌈
So yesterday I took 7 test all said positive. 2 of the test were the clear blue advanced and yesterday's said 1-2 and this morning it says 2-3. My period was suppose to start tomorrow and my last menstral was July 25. How far along do u think I am. I have my first ultra sound sept 12 and she said I should be around 7 weeks does that sound correct ?