Cramping. Is it normal

August 3rd we did <a href="https://glowing.com/glow-fertility-program">iui</a>. August 18th we got our bfp!! But I have been having a lot of cramping on and off since the 16th. Is this normal. Also it's usually just when I'm active or if I get stressed. But the past 2 night my cramping woke me up. No spotting or anything