Help..how fast does the pill work/change periods?

Hi.  I think i started my period today for june and also started taking my first ever bc pill. 
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I got fingered with precum/precum and/or precum slide from butox to vagina hole 21-22 days ago. (Day or two before fertile window began so went pee before and had not ejaculated for a while)
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I started the pill first time ever today and also started my period for this coming month today too. 
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Yay! All in one day!
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Question is..how fast does the pill alter your period/change the bleeding, etc. 
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Been having no cramps and stomach kind of feels acidy. 
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NO OTHER SYSMPTOMS.  
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It my first day on my new cycle and all day (from last night till up untill now (4:00 pm) i've been getting this:
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Bright red/dark red. Just stays in my vagina hole- doesnt come out onto undies etc. only comea out when i check cervix. 

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