Help please!! Chance I'm pregnant?

I have had irregular periods my whole life. I am 27 yrs old and have been TTC for 3 or so months now. I have been taking Upspring Fertility & Reproductive Support pills purchased from Target. I have never missed a pill. The first 2 months, I was super excited because my period came exactly when it was supposed to and so did my ovulation so in my mind- the upspring was working. However I missed my period on the 3rd month. It was supposed to come on Tuesday and it's now Sunday with no AF. I took a test Wednesday night, Friday night, and first thing Saturday morning and Sunday morning. All tests came back with a BFN. My moods/emotions are off the charts and so are my cravings. I have been constipated off and on as well as headaches almost daily. Is there a chance I could be pregnant? Or is my mind just tricking me and I'm just missing my period again? What do you think?? Has anyone had this happen when using Upspring Fertility?