Pregnant?

Sarah
Hey, I had the contraceptive injection a while back and I only got it once, I started bleeding about 2-3 weeks before it was meant to run out so I had sex once the bleeding stopped and bled a little bit every day for about 5 days, about 3-4 weeks after I started to feel off and sickly so I took a test & it was negative now 5 months after I still haven't had a period and my body feels strange, last week I went to doctors and she told me to go home and take a pregnancy test I haven't get I just wanted to see what you all thought before I do? Thanks!!!