Fading symptoms?!?!

Bird
Has anyone experienced fading symptoms and everything turned out ok? I have had severe tender and sore breasts for the past few weeks and have had slight period like cramping along with it. Went to OB appointment and she said symptoms were normal. Now, my breasts are no longer sore and I don't feel the heaviness in my belly anymore either. Took another test this morning and it's still reading pregnant. How long would it take for a test to have a fading line if something were wrong?? I'm making myself a nervous wreck worrying! Please help! What are your experiences??