Hello. I am 19 years old male. I lived with chronic anal fissure almost two years. I had surgery 4 days ago. And i think something is wrong

So its my 4 th day after the anal fissure surgery. Pain is pretty small right now. But after every time i take a poop i got a lot of blood on paper and sometimes on stool (Red blood). And after taking a poop i got a huge pain

((( Second problem is that i still getting something on my underwears

I tihnk its blood, because its red. Is it normal to bleed like this after the surgery 4 days ago ? Im going to my surgeron only next month. Im pretty scared.....