Pregnancy Test faint line not getting darker

[45yrold]

I am 45 and just had a postive pregnancy test.  This was not a planned pregancy, but welcomed all the same.  I really didn't think it was possible.  I tested two days before my period was due, now it is three days past.  The line on the test was faint the first time.  I've retested 4 times since then (the last time was first thing this morning) and the line is not getting any darker.  If anything, it looks even lighter.  Does this mean I'm not producing enough HcG to sustain this pregnancy?  I don't even want to go to a doctor if I am going to miscarry this early anyway.   I wasn't trying to get pregnant and not doing any fertility measures. I just want to go with what was meant to be, but this uncertainty is really playing with my emotions.

[RunningL8]

I just wanted to add that it's important to find out if you're pregnant, because if so, your doctor will probably want to give you progesterone suppositories and monitor your progesterone.  Progesterone runs low in older women and is necessary to have a good uterine lining to sustain the pregnancy.

[RunningL8]

I had an ept test that looked positive and was negative, and then one that was negative but I was pregnant.  The darkness of the line isn't supposed to mean anything.  I would get the clear blue digital that says either pregnant or not pregnant.

[1nana]

What are you testing with? First response early results (FRER) is supposed to be one of the best, along with the clear blue easy digital.