Nothing to get worried about at this time.
Hi and thank you so much for this query.
Blood in sputum becomes concerning if it lasts for more than 2weeks. Acute cough
with blood in it often represents common day to day pathologies and there is really no need to get too worried unless the volume of blood is huge and there are other concerning symptoms like breathing difficulties, high fevers, etc. The presence of blood is probably caused by a traumatized vessel during coughing efforts and would slowly reduce and stop.
In all, this is an acute finding and for now suggest no concerning pathology or poses a threat to life. With reassuring lung examination findings, there is no need to get worried.
I hope this helps. I wish you well. Thank you so much for using our services and do feel free to ask for more information and clarifications if need be.