When your tests dont get darker....

Elysia • Baby girl born Feb 2019!! 👶💖 followed by 3 angel babies 👼

What does it mean when the tests dont get darker but they dont get lighter either? My evening tests seem darker than fmu but over nearly 5 days they haven't gotten darker?

Background: had baby in Feb, no periods since having her, no clue how far along, midwife app next week and scan on 9th sep....

Two theories- really really early or further than thought and hcg levelled out