TTC Baby#2

So I totally forgot what I felt when I first found out I was pregnant with my daughter. I was intimate about a week ago ,3 days before ovulation and ever since then I’ve been cramping, extremely tired and back pains. Is it too early to tell if I’m pregnant or what? The night I was intimate my BF ejaculated 3 times inside of me and I haven’t been the same since lol. Usually when I’m ovulating it’s just another day no symptoms or anything like that. PLEASE HELP!!!