how soon is too soon to take a pregnancy test?

Macaylin
I know all the boxes say you can take the day of & what not but I would really like to hear from some ladies.
I'm 22, my fiancé and I had sex during my fertile period (twice) last month, I've been on & off nauseous for a few weeks (however this could be explained from not having a gallbladder and having an irritated digestive system), I've had no cravings, no spotting, and really haven't felt much different. 
I have had a few cramps that past few days, and I have been a few days late before (honestly it may be more often than I think, I didn't keep up with it till eve).....
So I kinda just want to get some advice, I don't really have anyone to talk to.
Thank you!!!