so I was supposed to start my period on the 20th (my anniversary) I didn't start so I took a pregnancy test. it was…

so I was supposed to start my period on the 20th (my anniversary) I didn't start so I took a pregnancy test. it was negative. the next day I took another one. also negative. well today I go buy a first response pregnancy test to see if it will make a difference, and my freakin luck, I started what I assume is my period. it started as brown thick spotting, and is now thin pink/red. should I still use the new test in the morning or does that mean I didn't conceive this month?