Can someone please give me advice

I had a baby on October 1st started birth control patch December 6 but it kept falling off so idk if it was even effective, I'm 15 days late for my period had sex last night and after I spotted a little now I have ewcm tinged with blood, why is this happening? Is there a chance I could be pregnant again? I'm planning to test but it just doesn't seem right.

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