Unexplained sudden bruising HELP!

Sarah • ttc jan 2016 - loss 10/25/16 & 02/22/2017
Woke up this morning to 3 large purple bruises on my thighs. I had no signs of bruising yesterday and have not injury myself in any way. What does this mean? I fooled it and it said some scary things like cancer 😓 any one else had this happen to them???