If i was having a missed miscarriage would my pregnancy tests get darker every morning & also would i have any symptoms..

Im not sure if i am or arent but when i got my positive tests from 12dpo i had sore boobs, headache and on and off neausea but since 4 days ago so 16dpo i have no symptoms of pregnancy abd my cervical mucus has completely dried up.

Anyone have any thoughts?

Can anyone reassure me this is normal.