I received my first depo injection May 27th, I was unaware that I should wait 7 days before having unprotected sex, and am pretty sure after doing research that I was ovulating around that time. My last period started May 17th. I have been having many pregnancy symptoms such as nausea, bleeding gums, cravings, ect. I have not had a period at all this month and have taken 2 pregnancy tests both of which were negative. Should I have a blood test done, or are these common symptoms of the Depo shot?