For context, I have IUD but periods are so so and I test every now and then, tested Sunday and I’m pretty sure it was negative after 3 mins and I was happy with that, found the test 3 days later and noticed a faint ish line now?? I am well aware that it’s way outside test window but normally my tests have always stayed negative with just one line getting darker even when I’ve come across them after some time. Any advice? I’ve had 2 pregnancies so familiar enough with tests but never had this before