Factors that break and don't break the fast

Waking up with some blood in one's mouth while fasting

Q: In Ramadhaan, when I wake up in the morning after sehri and performing fajar (for example 10 am). I always have a blood and it's taste in my mouth and I'm sure that it must have entered in my throat. What should I do for this because this is something impossible for me to control. And if this breaks fast then it means I have to repeat all my fasts. This problem is continuous with me. I cannot even make up previous fasts.