PREGNANT???

I am on the pill, take it everyday at same time. Never missed. Me and my boyfriend have sex regularly. My last period was August 11th and on 22&26 we had sex. A few days later I was spotting just for that one day. I am now 14 days late on my period. I've taken 6 preganancy tests and they are all negative. I've used Clearblue and First Response. I've used both digital and "old fashioned" I don't know what to do or what's going on. I have dr. appointment on Oct.4th.