Spotting before period

Okay so I know I just need to wait until after my period to retest but I’ve seriously been stressing. So I had light brown spotting on the 30th of January (2dpo) that only lasted a day. Took a pregnancy test 5dpo it was negative. Now I’m having more light brown spotting 7dpo. I’m thinking maybe stress has something to do with this but I have been nauseous since. My question is could this be implantation bleeding or brought on by stress? And is it possible to have implantation bleeding twice? Should I go see my dr? Please drop some comments. TIA. 🙂