Periods

So I had my period June 20-23 & then again July 1st-5th and I missed my period by 7 days and I took 3 pregnancy tests all negative, I woke up this morning had cramps but also noticed a light red spot on my panty liner. & not sure if I should get another test just to show up negative

I had a child a year ago, I was on depo and got off in April. Could it just be my body trying to go back to normal after coming off depo.. me and my partner have been having unprotected sex a few times in the past 6 weeks. I’m freaking out lol.could i be pregnant and not know it yet or is it to early to tell with a test