I experienced cramping and light bleeding on April 1st – about 18 days from conception based on my cycle. Either I’m beginning to MC or there’s some very delayed burrowing going on in there…
Found this online – “Implantation can be completed as early as eight days or as late as 18 days after fertilization, but usually takes about 14 days. Between one-third and one-half of all fertilized eggs never fully implant. A pregnancy is considered to be established only after implantation is complete.”