Is it possible to be pregnant if...

I had sex, then 4 days later I started bleeding/spotting old blood? It also happened 2 weeks before my period is supposed to start so I’m unsure if it’s possible to still be pregnant or not

It’s too heavy for a liner, but too little for a pad. It also wipes brown but slight hints of red, and will dangle out sometimes when I’m on the toilet

Unsure if I should still take a test as they’re quite expensive where I live

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