Implantation?

I ovulated on February 19th so now I’m 3 DPO and I’m having not really cramps but the feeling in your lower abdomen when you’re going to get your period soon. My husband and I have been having sex everyday since the 17th and my period isn’t due until March 6th according to Glow. Could I already be having implantation cramps or can you get this feeling while a fertilized egg is on the way to implant? We’re trying for our first so I’m not really familiar with what to look for. Thanks!