On Depo - could I be pregnant?

Hi all, I know yous are all thinking "just take a test" but I keep telling myself I can't be... so wanted some others opinions!
I'm 23, I've been in the depo since January 2016.  When I went to get my last injection, I was apparently two weeks late for it! They made me do a pregnancy test (which was negative) but at that point my bf and I had only been sleeping together for a week (unprotected) so that would be too early to show on the test?!
So... 4 weeks later, I'm feeling sick, tired, bloated and worried I could be pregnant.  
Has anyone else fallen pregnant when being late getting the depo injection?

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