Please help...worried mum :(

Please help...would anyone say this is a clot or a miscarriage? I am 5 weeks pregnant with a positive test on Friday (20th july) but bled yesterday with tissue/clots? Please excuse the photo but feel it's the best way to describe it (blood on tissue also looks worse as it has been wet). I'm stuck in a lull at the moment as Dr has said to wait for 2-3 weeks before retesting (phone appt), hoping someone may have some reassuring words. Thanks so much in advance. X