Thanks for posting your query.
As it has been a few weeks since your operation, the nausea
is probably not due to pregnancy
or operation related causes. Gastritis
is possible, after what you have been through, but you have been taking medication for that. Also, if you were given long term antibiotics, that could cause similar kind of tummy upset.
The bleeding should settle down in the next few days and is not a cause for worry.
However, if your tummy problems aggravate or do not settle down in the next few days, do go and see your doctor, who will examine you and may change your medication.