Symptoms 3 days after sex???

Nikayla • 28 years old • vegan •married to the love of my life• raising a little boy named River ❤

My husband and I had sex on the 10th and I was supposed to ovulate the 11th, i swear my body feels different. Today I've had MILD cramping and back pain and what feels little twinges in my uterus (implantation maybe?) . I know it's FAR too soon and most will probably think I'm crazy haha but curious to know if any second time mommas experienced symptoms this early? My last period was the 29th. Thanks :)