could i be pregnant?

so me an my hubby are trying really hard to have are first baby together see im 4 days late an we had sex the 30 of sept. an my period was do thursday the 10th friday i for sure thought i was going to start causr i had cramps an lower back pains wen i went to the bathroom there was only a tiny blood spot an thats it i havent bleed since i feel fine no cramps nothing jus really sore nipples i told my sister that the 30th was my last day of ovulating an she said that theres a really low chance idk i want to test but i dont want to get my hopes up what do yall thank?