I currently have a drainage tube like yours in (but mine is in my butt) – over here in Aus they refer to them as ‘mushroom drains’ because the part at the top pops open like a mushroom to keep it in. mine has been in since the 20th May – I had my check up yesterday and the surgeon told me it will be coming out this next Thursday.
I have had drainage coming out both from the tube and from the area around it – which was originally an abscess and resulted in a fistula. I also have a seton in (which was originally put in to drain the abscess, this mushroom drain was inserted after it was discovered the setons weren’t draining it adequately).
The setons are quite painless after the initial recovery time (which for me was a month or so). This drain is a real pain because I have to sit on it at my job and it is stitched in, but I am grateful it seems to be doing its job.
I would say the drainage is probably normal unless it is hurting a lot too, which would indicate infection. Are you on antibiotcs? I am on amoxicillin and flagyl (have been on these since November last yr when the abscess first surfaced).
Hope this info helps you somewhat! Did you see your surgeon?