what does that mean

I took a test those 99 cents store one ready it within 10 minutes was negative ! The only time me and my hubby had unprotected inetercourse was sept 15 and sept 21&25 but he pulled out those times me I received my period sept 27  well I took the test and later on in the middle of the night I decided to take a look at it and it had. A very faint positive line ? What does that mean I have no had any intercourse since those days since I am waiting for my insurance approval for any method of bc since they do not want to approve anything 🙄rather not risk it ?