I can't speak to the clear liquid issue - but I suggest you call your doc. I was told, and it was true, that I would experience bloody and perhaps slightly painful ejaculations for several weeks. It got better each "time" and within a month all was well.
By the way, if I understood your post correctly, the pain you experience was during the biopsy. There is really no reason to have a painful biopsy these days. My urologist did my biopsy under anesthesia. Other than a little post-procedure discomfort and the aforementioned ejaculate, it was no big deal and certainly there was no pain.