Is this a chemical?

Not sure what’s going on. My October period was on 10/19 but was only 4 days (usually 7+ days) and it was light. I decided to take a test on Monday as I was a week late and got a faint positive at 3 min. The day after I began to get severe cramps and bleed heavily. I’ve been bleeding heavily and cramping really bad since. I took another test yesterday and the line was darker (not sure if the blood made it darker). I forgot to take pics when I took the test but this is the test now that they’re dry. The lines are way lighter now that they’re dry. Top test is yesterday’s and bottom is Monday’s.