Can i be pregnant ??

So I am at 8 dpo nd my period is due may 7th on lately feel tired and sleepy.on friday april 28th i had bad lower back pain and cramps.it was a bit painful lasted for 3 hours.my fertile days was on the 18th to the 23rd and had intercourse every other day . My mouth feel wierd so much saliva like i can literally spit out every minute if i have to.I have been peeing alot as well. Also yesterday had a yellow sticky cm.no smell or itching But can it be too early to test i dont want to dissappint myself .