We are happy to offer this service. Your questions are not a bother at all, and are always welcome.
1) Even if it seems like you have a lot of blood, if it does not reach your underwear, it is unlikely that it is a flow. Therefore, even
stains larger than a
gris (the size of a US dime or Israeli shekel) may be disregarded and do not render you
niddah. Sometimes a very small amount of blood found in the toilet bowl tints the entire bowl pinkish. This does not mean that you experienced a significant amount of bleeding comparable to a flow. Any blood found in the toilet may be disregarded (unless you actually saw it exit your body).
2) According to Ashkenazi halachic rulings, as well as those in some Sephardi communities, the
5 day minimum begins from when you actually consider yourself
niddah. If this is your custom, you may not count the 5 days from when you are acting in limbo out of doubt. If you are sure that you will be rendered
niddah at some point, you may perform a
bedikah and purposely render yourself niddah in order to start your 5 day minimum. However, if there is a chance that the staining will not make you
niddah at all, we do not recommend doing this.
Please feel free to get back to us with any further questions.
B'Hatzlacha!