bodies are weird

So I had a pregnancy September 3-December 9 then another January 4-February 10 and now I'm late on my period my stomach is hard I have cravings and neasuea and tender breasts and sore legs and lower back.
Constantly my tests at the doctor and some store bought are negative but I have had my miscarriages that I've seen and also have felt kicking the 1st time around.
What should I do ? 
Advice ?
I've had unprotected sex occasional condom and pull out method sometimes. 
Opinions and advice welcome.