I got my period on the 20th and it finished on the 26th and two weeks before hand me and my partner had sex multiple times with out protection but he never came in me but he didn't pee or shower inbetween one night.. I'm also 4 months pp and freaking out.

The only reason I'm freaking out is because my breast are extremely sore and I feel sick every day when I'm around food so I eat thinking it's because I haven't eaten but then I spew.. I took a test before my period but it was negative, can women still be pregnant after a six day period?