First Response Early Result tests 🤔

I used these tests when TTC our August 2021 baby and found them really good, never any inclination of a second line until I actually was pregnant! Took a test this morning to put my mind at rest fully expecting it to be negative, it's probably even too early to test but this faint second line appeared straight away 😅 I would only be estimated about 8-10dpo, not actively trying but had one "whoopsie" in the fertile period 🙈 It took 5 months of actual trying to conceive our first! Has anyone had this happen before? What was the outcome? I will retest in a couple of days but this has thrown me and just wondering what others experiences are 😊