depo shot - pink discharge!Help!

Em
So I had my first depo shot on 29th march. 
I had it on the last day of my period so assumed I was automatically covered. Started having unprotected sex the following day. 
My period did not show. Fine that's normal on depo so although felt strange it wasn't there I didn't get to worried.
2 days ago I started having a very pink discharge, this was only when I wiped and not coming out into my knickers.
Last night we had sex again and it was quite painful ( generally gets lie that when my cervix sits low) and there was a lot of pink discharge, but it wasn't blood.
Since then I have had nothing.
Is this breakthrough bleeding? 
I must say I've never had anything this pink before in my life!! 
Thanks 

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