Since you are unsure and ask the question, NO - it is not OK to wait until Monday. Make the call now. There should be NO blood, and things can get worse.
If this is known and treated condition that happens on a regular basis for you, follow your doctor's directions on when to call.
What's with this Bleeding ? 6/2015
DX: HG Papillary & CIS
3 Years and 30 BCG/BCG+Inf
Tis CIS comes back.
BC clear as of 5/17 !
RCC found in my one & only kidney 10/17
Begin Chemo; Cisplatin and Gemzar
8/18 begin Chemo# 3
Begin year 4 with cis
2/19 Chemo #4
9/19 NED again
1/2020 CIS is back...
It is hard for us to know how much blood you are passing. If you are worried either call you family doctor or urologist if you have one now or go to an urgent care or the ER. If you have a history of bladder cancer and have experienced this before and know that the amount of blood you are passing is not critical you may be ok to wait but it is best to approach visual blood in your urine of unknown origin with caution.
Cynthia Kinsella
T2 g3 CIS 8/04
Clinical Trial
Chemotherapy & Radiation 10/04-12/04
Chemotherapy 3/05-5/05
BCG 9/05-1-06
RC w/umbilical Indiana pouch 5/06
Left Nephrectomy 1/09
President American Bladder Cancer Society
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Alan, 
eddiek 