Blood in snot. Serious. i am scared.

So, since yesterday morning when i pull out snot from the back of my throat i get blood streaked snot as shows in the picture. I ensured i don't pull it forcefully but today morning again when i gently pulled it(no force, i let it come automatically to the throat then took it out, so there was slight blood very less). But after that i sneezed, and this time when the thick jelly like mucus(probably congested) came out it was blood streaked too. Slight blood. Its like there's a cut somewhere and from there the blood is getting attached to the snots. I cannot go on antibiotics as recently i had gastritis due to medications for adult chickenpox and also antibiotics post that. Before that too i had multiple rounds of antibiotics prescribed due to a chest infection. Please help me what should I do. I did saline water irrigation. And taking steam. Pls help me if this is something serious. I am scared.