Help! I am confused

I am 18 DPO, 4 days late, on day 38 of my cycle.

2 tests taken were invalid(clearblue digital and clearblue that the test strip line didn’t even come up) then I took these 2 and I think I see a faint line on the top test but I am aware it could just be an evap or indent line.

My partner and I had unprotected sex 3/26, 3/31, 4/1 4/4 and 4/12.

Yesterday for about 12 hours I had faint light pink/rust colored spotting. Today nothing. No AF, no signs of her. Sunday night I felt cramping (similar to my period cramps), backache, headache, nausea with no vomiting but gagging. Then I get these two(I consider) negatives, but there is no sign of my period beginning. I do not want to get my hopes up. I am getting mixed reactions in multiple apps that I 1. Should have a more definite line at this point or 2. Someone does see the line. I’ve prepared myself for either response as my partner and I gave up actively tracking and trying months ago. I just want advice, opinions, suggestions? TIA