Pregnant?!?!?

Kayce
OK so I may just be going crazy but my bf and I are ttc. Well earlier this month aunt flow was 3 days late and then when she did come it was only for one day! One day but completely normally for the first day and then just some light spotting the day after and nothing on day 3. Note: I have a 2 year old and after I had her I fell into a very consistent cycle. So I took a couple test and they came back negative and now 2 weeks later and I feel like I am hungry and tired all the time. I crave sweet things (which is not normal for me) I don't know what is going on.. I wanna take another test but then again I just think my body is playing a crual joke on me... am I going crazy or has anyone else had anything like this happen to them?