Mishnah Mikvaos 8:2: These are the ba'alei kerayin who require immersion: if one discharged drippings or a murky liquid at the start [of his urinating], he is pure; in the middle or the end, he is impure; from the start until the end, he is pure. If [the discharge was] white and flowing, he is impure. Rabbi Yose says: white is like murky.

אֵלּוּ בַעֲלֵי קְרָיִין שֶׁהֵם צְרִיכִין טְבִילָה. רָאָה מַיִם חֲלוּקִים אוֹ עֲכוּרִים, בַּתְּחִלָּה, טָהוֹר. בָּאֶמְצַע וּבַסּוֹף, טָמֵא. מִתְּחִלָּה וְעַד סוֹף, טָהוֹר. לְבָנִים וְנִמְשָׁכִים, טָמֵא. רַבִּי יוֹסֵי אוֹמֵר, לְבָנִים כָּעֲכוּרִים:

Mishnah Mikvaos 8:3: One who discharges thick drops from his member is impure, according to Rabbi Elazar Chisma. One who had [sexual] thoughts at night, and woke up and found his flesh was warm, is impure. A woman who discharges semen on the third day [since intercourse, including that day] is pure [i.e. even with only two nights and one day in between intercourse and the discharge], according to Rabbi Elazar ben Azarya. Rabbi Yishmael says: there are times [when she is pure] when there must be four time periods [in between; i.e. according to Rabbi Yishmael she is not pure until the fourth day, meaning there have to have been at least two nights and two days between intercourse and having the discharge], times when there must be five time periods [in between, i.e. two nights and three days], and times when there must be six time periods [in between, i.e. three nights and three days, for example if she had intercourse at the start of Shabbat night, she is only pure if she has the discharge on Tuesday night or later]. Rabbi Akiva says: there must always be five [time periods in between, before she is considered pure].

הַמֵּטִיל טִפִּין עָבוֹת מִתּוֹךְ הָאַמָּה, טָמֵא, דִּבְרֵי רַבִּי אֶלְעָזָר חִסְמָא. הַמְהַרְהֵר בַּלַּיְלָה וְעָמַד וּמָצָא בְשָׂרוֹ חַם, טָמֵא. הַפּוֹלֶטֶת זֶרַע בַּיּוֹם הַשְּׁלִישִׁי, טְהוֹרָה, דִּבְרֵי רַבִּי אֶלְעָזָר בֶּן עֲזַרְיָה. רַבִּי יִשְׁמָעֵאל אוֹמֵר, פְּעָמִים שֶׁהֵם אַרְבַּע עוֹנוֹת, פְּעָמִים שֶׁהֵם חָמֵשׁ, פְּעָמִים שֶׁהֵם שֵׁשׁ. רַבִּי עֲקִיבָא אוֹמֵר, לְעוֹלָם חָמֵשׁ: