Tests getting lighter?!

Yesterday I took 3 pregnancy tests and they were clear positives and the digital said 2-3 weeks so this morning I took a strip and the strip was lighter and the digital said 1-2 weeks. What could this mean? I'm not having any pain or bleeding. I had my period from 12/21-12/25 and according to glow am supposed to be ovulating this week so I'm just not sure what to think. Anybody who has any suggestions please let me know.