Please help me understand

Hi! So i screenshotted my April month. Im late on my period. I tested this monday with FRER and got a faint line, but now im thinking it was a evap line or indent because i tested again this morning and its still faint, almost nonexistent. I tested with clearblue and feel like i saw something but im not sure. I felt cramping and muscle like pulling sunday night and my boobs/nipples are tender still. Is it maybe too soon to test and thats why im getting faint lines? Any insight is appreciated!!