So, ive been testing since 9 DPO, took 3 internet cheapies and a FRER all within 40 mins of each other and these were the results then v

10, 11, 12 DPO my lines nearly completely went away on the cheapies and the FRER's didnt get darker. took another FRER test on 14 DPO and it looked completely white, had sevete cramps that night that lasted roughly 10 minutes and thought that that was gonna be it and i was gonna have a chemical and miscarry that night. well the cramps stopped and i never bled and still havent started bleeding...

17 DPO (yesterday) rolls around and i tested again and got a noticeable line that i didnt need my flashlight to see it clearly anymore (17DPO test pic below)

now i know im definitely not tripping... that line is definitely pink. but this is the first time its been this noticeable on a FRER out of the 6 ive taken and im 17 DPO... i didnt confirm ovulation this cycle, mustve missed testing it, and my cycles are no longer than 35-37 days. i am 5 days late for my period now (18 DPO) and tested again today and my line looks just like 17 DPO's

had anyone had this happen or have had a pregnancy where your lines never got darker yet your pregnancy was viable and you carried to term? any help would be mega appreciated