it's very uncompterable and i hate it!
When a woman is aroused sexually, you produce lubricant, the added fluid mixes with your normal discharge to appear as an extra heavy flow. Bottom line, it is normal, don't worry about it.
I never heard of this before but my guess it has something to do with your hormones
You need to bother about it as long as it is not for extended days of period.
Perhaps you just imagine it.