Late period could I be pregnant?

leeanne • Gave birth to my 👼🏾 at 20 weeks 12/9/19 💔😢

I had unprotected sex on day 15 of my cycle so it’s in my fertile window. I’m now 3 days late I took a test on my period due date it was neg and one today which is day3 and also neg. should I try clear blue digital would it show up ? Iv been feeling bloated and very emotional/sad normally I’m very positive and rarely feel sad. No other symptoms. Is it likely to be a late period or could I be pregnant.