Kim, It all depends on what pregnancy signs you are talking about.
Morning sickness is supposed to totally disappear as soon as your body adjusted to the new hormones. The same can happen with the sore and sensitive breasts. As soon as your body adjusts, it can get better or disappear.
Your tummy growing, you gaining weight and your breasts getting fuller and bigger will increase for the duration of your pregnancy.
Cravings can come and go and frequent urination will become more necessary as the baby grows. At 5 weeks you might not even have started experiencing this.
Best of luck with your pregnancy!