I just also had miscarriage from an unknown pregnacy. I didnt realise, but i was experiencing prenancy symptoms (upset stomach in the mornings, sensitivity to certain food smells) and when i went to the toilet, something was there that shocked me. It was an embryo, with its cord so tiny it was barely there.
There were no symptoms to know i'd had a miscarriage, and if i hadnt had the heartbreaking and shocking experience of seeing this I may never have known. Since then, my period was heavier than normal and i had some painful cramping but it was al gone after a day or two.
Just make sure you go to the doctor and have an ultrasound so that you know all is ok.
And talk to those you love, as the emotional pain is the worst of all.