problem or not ?

hi guys

i have a problem with my leg ...
here is the story
i was playing rugby at the club about 2 weeks ago and there was a tackling training . i was tackled by this dude really hard and somehow landed my knee on my shin bone on the inner side . it really hurt at the time but walked it off and was sore . ok its like 2 weeks later i have no bruise i can walk normally no problem but now when i touch the area with some pressure where my knee landed it hurts like hell !!! i when i gently stroke my hand over that area its soft and there is this kind of soft like a liquid is under it could it be blood , pus ??? or wat ??
should i wait ?
or
go to a doctor ?

any idea wat it could be ?

cheers

Best go and have it checked out by your doctor.Often you can get fluid build up from a knee injury and they have to drain it..