Spotting or period?

Elizabeth • 26. Married to my best friend. Have 2 amazing sons Nathan (9/8/13) and Oliver (5/27/16) and a little lady Annabel (5/9/18)

So my son will be 14 months next week and we're still nursing. I have not had a PP period yet. I have been watching cm/cp for signs I may be ovulating and I thought I ovulated on June 20th but then had spotting on the 29th for 2 days I thought may be implantation bleeding but all tests were ➖. Could that have been my 1st period? Anyone else have similar experience