Pregnant again?!

I am 7 months postpartum and 6 days late with my period. I haven’t been late & my period has been consistent always. I feel off, feet hurt, nauseous, tired. Weird appetite. My test was negative but that was 2 days ago. I know last time it took longer to show positive…I’m not on BC but he pulled out. When should I test again? Anyone else have a similar situation?