I took this test this morning and the line wasn’t there. Maybe I didn’t wait long enough but I pulled it out of the trashcan a few hours later and now the second line is there! My period is also 2 days late.

Update: my period started this afternoon even though I had this result this morning. Maybe it was a false positive? It’s worth noting that this test was taken exactly 1 week after sex and according to Glow it was during a low fertility window so it seemed unlikely to be positive. Why would a second line appear? I also took a second test around lunch time though that one was definitely negative.