I think I'm crazy

Br
Ok so I don't know how far along I am I thought I was 8 weeks but I remember my last period was like 1.5 days and I barely bleed like not really even enough to spot and I was a week late but I thought it must be me getting off of the birth control that's messing me up and I took a test it was negative... next month no period and positive test. But I swear I feel movement already... I know it's not gas and I thought oh maybe it's muscle spasms but it's only in one area so I'm freaking out here! And this is my third kid so I know what baby movement feels like... I just hate this having no idea of how far along I am!!! I go to the dr Monday and I'm really hoping they will do a dating scan... what do y'all wonderful ladies think what's going on with me?