Anyone chart?

Keysha • 32yr momma & wife. 👶🏼 was born 10/3/11, married 💍 my best friend 8/31/16 after 3.5 years. Trying for our 2nd! Ttc 2yr
So my chart was looking good but now my temp is dropping in literal phase. And my cover line was actually removed from another app due to this drop. What could this mean? Last cycle my chart looked good and didn't drop till period was due. Any input would be great.