Weak Pregnancy?

So I am pregnant for what will hopefully be baby 3, I have carried full term 2/3 pregnancies. With all three I was so I’ll by now I couldn’t lift my head or drive or eat....the only symptom I have now is fatigue, and it has taken a very long time for test lines to get dark. With all my previous pregnancies they line was EXTREMELY dark over a week before missed period. Now I’m a week after my missed period and line tests are extremely faint and take a minute to show, but digital are all positive. Should I ask for blood tests to see how everything is going and if this pregnancy is going to stick? I’m very worried about this pregnancy as is because we have a lot of stress in our lives and I don’t want that stress to hurt my baby, our stumble over into my toddlers and SS’s life. Extreme stress didn’t help with my first to. (Very unexpected pregnancy this time 🤣) I just don’t want to get my hopes up. We haven’t told anyone yet either.