I only had one period after ds was born then i conceived dd, i felt that ovulation and actually thought i might have been pg again as it was so crampy (just like when you are first pg). 2 weesk later and when AF arrived i realised what it was. It was great because my next cycle i didnt O until cd21 and we were ttc again so when i felt it i was like "oh, ok now its time to dtd" lol.
I had previously never noticed it so strongly