The clots can be a normal period, but if they are unusual then there may be a problem. I suggest that you take a pregnancy test to confirm or deny your suspicions. Or if your really worried, make an appointment with your GP. Good Luck
Please get the Urine preg test and confirm whether you are pregnancy or not. If it is pregnant then we can see whether it is abortion. The clots and bleeding could be miscarriage or normal period.