Re: not sure if this is a part of IC
I find this happens with my urine in two situations:
1) when I'm flaring badly, and there's blood/extra white blood cells in my urine because of it
2) when I have an infection
If you don't have any way to test for infection at home (I've started having test strips on hand at all times!), it might be a good idea to get a test done at the doctor's if your pain level is higher than normal. UTIs + IC are not a fun combination! For me, the telltale sign that it's a UTI and not just IC is the "pinch" in the urethra as I'm finishing up, but your symptoms may vary!
If your pain level is low, however, then it could just be because of random IC stuff.