I had a mc 2 weeks ago and think I'm pregnant again

so I had sex a couple of days after my mc and then had it a couple of days later we didn't use anything BTW but now it's a week later and I'm having cramps could I be pregnant just 2 week after a mc u haven't even had my period yet but the doctor said because I was only 4 weeks the period could of got mixed in with the mc so I had both a mc and a period can someone help