Early pregnancy symptoms?!!

So I've been having unprocted sex over a week and today I've been having really light spotting and mild cramping and the feeling that my stomach is very bloated?! I'm due for my period in a couple of days I'm not sure if it's signs of pregnancy or my period starting?
​From what this app said when I had sex wasn't on my fertile days tho? 
​I'm really hoping I'm pregnant, would be the perfect Christmas gift! Xx