Well, yes, it's possible that you saw evap lines.
The thing is, constipation, more frequent urination, heartburn, severe cramping, and extra discharge aren't symptoms of a healthy early pregnancy.
Constipation, frequent urination and heartburn are symptoms of late pregnancy, caused by the size of the baby pressing on your organs. Severe cramping indicates you may have a period on the way that is a little late, and heavy.