8 weeks pregnant and faint line on pregnancy test normal?

I’ve had 2 losses in the past and sometimes I get scared because I lost 2 babies this is my 3rd pregnancy and my symptoms were starting to come and go so here comes me my worried ass taking a pregnancy test the line did get a little lighter but not as much but it did get light I did a ultrasound at 7 weeks and baby has a strong heartbeat and is growing fine it’s just I get worried because of what happened. But I read that is it true once u have a lot of hcg the test causes the line to be faint? No bleeding or cramping