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Your post states that you missed your birth control (seasonale), had unprotected sex, got a delayed but heavy period for one day and you started the pill the next day. This points towards a few things. Either this was a normal period or this was withdrawal bleeding or this was an early miscarriage.
The only way to confirm is get a pregnancy test. If this was miscarriage too, there is a chance that the HCG levels will be still high (usually remain high for a month). However with miscarriage the bleeding should have continued. Also if there is a pregnancy then also the levels will be high. If this was withdrawal bleeding or miscarriage then you can carry on with the pills.
You can discuss these possibilities with your gynecologist as on net and without examining it is difficult to give a confirmed opinion. Hope this helps. Take care!
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