As we've gone over before, bipolar disorder has existed for far longer than SSRIs or even any antidepressants, and while depression
is often the initial symptom, it is possible to have unipolar
mania (and since mania is all it takes for a BP I diagnosis, this means you'll have the BP I label). Also, a mixed state counts as mania, since by definition a mixed state involves fulfilling the criteria for mania and depression simultaneously.
You need to get on top of this.