Lines getting lighter

Does it matter the time of day you take your pregnancy test.

I’m currently 7 weeks today and haven’t really been feeling any symptoms. So I take a test every so often to make sure my brain still remembers I’m pregnant.

I found out at 10 dpo. And only had one hcg level done due to safety at the hospital. That number was 288. But I was early then.

So I just took one at 1:00. And both lines came up. But then the test line got a bit lighter.

I have gone through one miscarriage once before but never saw the line decrease.

I go in for my first ultrasound on Wednesday and I’m worried I won’t be hearing a heartbeat.