Preggo???

I took a pregnancy test and it came out with only one line (indicating not pregnant) however, when I came back the next day, it showed one line and one faint one.

Scared, I took another test. After 2 minutes, this was the result:

However, I came back hours later and it read the same as the other one:

I am on my period but it’s is extremely light. Typically it is very heavy like CRIMESCENE heavy. I get stomach aches once every 3-4 days (nearly) in the middle of my stomach that last for 10 minutes max. I’m on birth control and I’m usually pretty consistent.