Infection not going away after antibio.

6 days back i had a throat infection and i was having inflammation. So i showed to an ENT and after seeing he said it's tonsillitis and pharyngitis both. Now, i was put on amoxyclav, montek bl, some nasal spray and steam inhalation. Today is last day of antibiotics. But 2 days back i had yellow sputum/phlegm while coughing in the morning. Idk due to coughing more or what I ended up coughing blood along with phlegm. Which didn't occur later in the day even tho cough was there. Currently, my symptoms are coughing (before i used to cough 8/10, now its 4/10 if asked by level). When i force my nose or pull the post nasal drip it is stringy or else thick yellowish snot. Apart from the when i cough phlegm from chest is yellow. I am too scared now :(. Please help me. I am taking alex cough syrup thrice a day 1 tbspoon right now. I feel a little tired too. No fever however. Please guide me.