Cramping, Ovulation, and Pregnancy

Does the cramping feel different for these three things or all same? Can sensations feel different. Maybe a silly question buy I'm curious. I used to only cramp during periods for first day or so. Recently I had some cramping around time of ovulation. Since March my cycles have been all over place things have changed a lot from being regular every 28 days for 5 days to all over place. I am ovulating on day 27 to 28 of cycle last two months. No period since July 26th (when my last ended) . On my charting here I should be in my fertile week next week that's way off at this but no period yet. My husband and I have been active not using protection if we have kiddo awesome if not yet okay with down the road too. Anyways are there any subtle differences between cramping and symptoms. Just looking for advice and experiences of others.