I have very rwgular periods, 30 days length. So I had unprotected sex three days in a row August the 23,24, and 25 and especially the day I ovulated or supposed to anyway the 25th. and then the next week I was spotting for 2 days september the 3rd and 4th. And then the following week I was supposed to start my period the 8th or 9th but it didn't come. A week later i took 2 pregnancy tests 2 different days and they looked negative but I am sure I was able to see the faintiest line but until now am not sure and haven't taken another test. What should I do?