How soon to test??

Tayler • BOYMOM💙FURMOM🐶ANGELMOM👼🏻
I've just got to put it out there because I am loosing sleep, sick to my stomach and have been overwhelmed with thoughts.. 
SO and I had unprotected, no withdrawal sex on my most fertile day along with two other days where I was "high" level ovulation..
My period is always 3 days early, it should have come the 21st, yesterday the 24th was my actual start date and NOTHING!
I was sick Thursday and have had off and on stomach aches, cramping last night and very tired..
I'm so excited but at the same time also worried that it's a short month so maybe my period is just more delayed than normal? 
I don't know, can someone help ease my thoughts 😂 can I take a pregnancy test when I've only missed a day of my period???
My first pregnancy I never even thought I was pregnant because I never tracked my days so when I missed my period two months in a row I just thought my body was betraying me as usual haha.. this time after the deed was done (drunken night) I realized the next day it had been my most fertile day.. i don't know, I just want to sleep and cannot! I am so excited but also so scared!! Ha