Hi welcome to Health care magic forum.
Thanks for calling.
Leaving aside the expected date, the pain and bleeding after the sex represents, some or other infection. may be trichomoniasis
, yeast, candidiasis
I advise you to consult a gynacologist for diagnosis and treatment. you may need a manual examination of the parts, for confermation. Period that will come on its way indipendently.
Don't worry it is a common problem and will be cleared completely.