Leg bruising at 11 and half weeks?

So, since about week 7 I've been getting like dime sized bruises on my inner thighs by my knees. They don't hurt but they just keep popping up in the same spots, 4 to 5 at a time ans im not one thay bruises easily if at all which is why its worrying me. Anyone know what it could be? I'm worried I'm deficient in something as I do have a history of random drops in platelets and anemia. Thanks in advance!!