I am an 18 year old female. I had been taking the hormonal birth control pill for 2 years for my heavy irregular periods. Also, while I was taking the pill I never menstruated. I decided I wanted nexplanon but was not given it because it would be a hassle to remove in case I did not like it, so I was told it was a better option to get the depo-provera shot. I received this shot on september 27th and have had no bleeding at all and no sexual activity. Is this a sign of infertility?