Possibly pregnant but had a period?

Kim • 👼🏻MC 12/5/17👼🏻💖09/2018💖💙11/2019💙💖02/2021💖💙01/2022💙

So I’m 14 weeks pp. My SO and i have used protection. I’m on BC pills. I took a test a few days ago because i had been feeling lightheaded and I’ve had terrible headaches. And i thought i had seen a very very faint line. You had to squint your eyes a lot to see it but i didn’t take it as positive. So i took one a few moments ago and the lines seems darker and you don’t have to squint your eyes as much. It’s definitely there. But i don’t understand how that’s possible? I had my first period after birth on Dec.8th as seen on first picture. And then i had another period that same month on the 27th. I thought it was probably a chemical pregnancy but ever since i started taking test last week they’re getting somewhat darker? Has anyone experienced this? Could it be false? I’m definitely not trying to conceive right now. I had an emergency csection. TIA!