Period and still pregnant?

Nora
So i got my period after a broken condom incedent (took this country's version of EC 4 gynera pills for 2 days every12 hours) 
Well i read online (i swear the internet makes stuff worse somtimess)  that you can still be pregnant even if you get your period,, i took a test yesterday and it was negative (i was on my period) should i be worried ??