Light bleeding after sex 8dpo

Le
I'm curious if this would be ib or just due to sharp fingernails or something lol. 
We aren't trying to get pregnant simply because I have no savings right now so it would just be smarter to wait a little . But we weren't preventing either (not for years) I assumed we weren't getting pregnant due to his steroid use. 
And we only had sex the day after my predicted ovulation date and at dpo 8 . 
Just curious what people think ? I know no one can know for sure 

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