There is practically no way that brake fluid can enter or leak into engine oil unless you pour it by yourself.
If you see brake fluid level low and engine oil level high, its two different issues.
Brake oil must be leaking and getting low.
Check engine oil again twice or thrice for to be noted perfectly if its getting increased by time. If yes then it must be turning little milky liquid than oil because of leaking coolant from head gasket and hence also depleting the coolant level.