Too early to test?

My last period started on September 23rd. I had my son in August and so I didn't get the okay for sex until the 28th and we did. I had been on the pill for 4 weeks and didn't miss a single day. For the last week I have been nauseous, had fatigue, sore breasts, increased appetite, and cramps. These are all signs of ovulation so it might just be that. Also I've been having sharp pelvic pains and a lower back ache which are signs of an ovarian cyst. I had all of these symptoms when I had a cyst last November but I got that cyst at the same time I conceived my son and I was having all of these symptoms. The pill is the only method of birth control my fiancé and I use. I have a doctors appointment tomorrow morning to see if I have a cyst. How high is the possibility of me being pregnant? I'm supposed to start my perio between the 21st and 23rd. Is it too soon for a pregnancy test to have a correct result?