Periods while breastfeeding

Christina

I’m a 33 year old FTM and my daughter is going to be 17 months in a week and a half . I finally had my first PP period last month and it was so short and light compared to how they were before. According to this app I was supposed to start my period on Monday and here we are Thursday and no AF. I took a pregnancy test today island it was negative. I’m wondering if this is normal? Hubby and I are wanting to try for baby #2. We want our kids close in age so I was really hoping for a positive result today. Any insight welcome. Thanks!