So I got a light pink spotting 2 weeks ago, it was a little late but still around the time I'd normally get my period. it lasted about 3 days (my reg period lasts about 4-5).  I took a pregnancy test, negative. Then my fiancée and I had unprotected sex and took plan b a couple days later... 

My breasts have been SUPER sore for the past week and I'm super tired after work, I get nauseous during the day as well.

Now 2 weeks later I have the light pink spotting again and sometimes a little more blood shows up, idk if this is normal or if I should take another test?