Really confused

Sara

So I was on the depo shot last year I was due to get it again in December. Me and my bf decided we wanted to start trying so that’s why I didn’t go back. I had already been to the dr and the checked everything through an ultrasound and I’m good! Throughout my birth control I had a period every month. In December I didn’t. I got my period back In January. 1/7-1/12 was my period. Since then we have had sex. I was due for my period 2/4 but hasn’t came. I’m currently 7 days late. Taken a test when I was 4 days late and came back negative. I’m 21dpo and having a lot of symptoms: bloating, headaches, lower back pain, nausea, frequent pee breaks, mood swings and my pants are getting a little tight. Trying to hold off on taking another one but getting very anxious.. help me please!