pregnant or other?!!! ** HELP**

Okay so I am now 27 days late and feeling sick and tired and drained. Could this be pregnancy or other symptoms? Also I have taken loads of tests and two look like they could be positive however I have taken around eight and the rest have been negative. I'm getting reallly excited about this and would love to know what y'all think, pregnant or not?!!! Also I have calculated how far I might be and I could be about 3 weeks if I am, if that helps at all!