HELP I want another baby so bad but...

Okay so myself and my partner already have a little boy whose 3 and we’ve recently been trying for another. I’m due for my period Sunday but for the last 2 weeks I’ve been getting cramps, I’ve been really fatigue and certain foods and smells are making me sick. I didn’t find out I was pregnant with my son until I was about 8 weeks and I’m starting to think I maybe be pregnant but I don’t want to do a test until I get my period or not. What do use think I should do? And do use think I am or not?