Pregnant or no

Pregnnacy tests are popping up with faint lines but if I take different tests from different brands the tests are negaitve so does that mean I’m not pregnant or that I am just too early to use other tests. I have been using Walmart and dollar general brand tests. That are 1$ here’s all three tests today and yesterday had my misscarriage on December 22nd so I made sure all tests were negative before trying again. Could I be pregnant or is this negative still