Helppp 😩

So my current partner & I have been trying to have a baby. I tested the other day since I didn’t have my period, but the test came out negative & I started my period later on in the night. But this is the weirdest & shortest period I’ve ever had. I bled the first day, then the two after have just been brown blood. & it is NEVER like that. I know periods usually mean you’re not pregnant, but you can get your first period when you’re pregnant, it’s not uncommon. Should I wait another week or two to test or just not worry about it ?