Sorry to hear that, I am disappointed that your EPU didn't help you out with advice, they really should have given you more support and information.
Like Red said, it might very well be implantation pains, which for me felt like I was having a period. But you have to be aware of the fact that you might bleed and that this could be a Miscarriage.
I'm sure you feel a mess and need more advice, but I suggest giving it a few days to see what happens. You will either have a bleed or not, and either way, I would go to your GP or contact the EPU for further advice! Even if it is for support!
Take care and keep us updated, there are lots of regulars here to hand out advice x x x x