Had FET on April 14th with 5 day blast. I had mild cramping Thursday, Friday the cramping was a little more intense and very fatigued and then the cramps subsided. No more cramping until i was awaken with cramping at 3am this Sunday morning. Could this have been implantation. I got up because i had to use the bathroom and then went back to bed. The cramping kept me up for like 10-15 minutes and then just like that it went away and i went back to sleep. I test on Thursday and i pray that was a positive sign.