Hi. I've Taken 2 Clearblue Digital Pregnancy Tests. Both Came

Hi. I've taken 2 clearblue digital pregnancy tests. Both came up "not pregnant" I've opened the tested and both tests when I took the had 2 lines on one strip and one fant line on the second strip. What does this mean? Am I testing to early for it not to come up as "pregnant". Because I've looked up so many things about the test. The test only picks up HCG not your LH hormone. So bit confusing. Any info you could give me ? Where I have pcos I don't have periods so it's harder for me to find out when and if I'm pregnant