Skip AF for one month?

Hi ladies! I'm currently 8months PP and I had my AF returns 5 months ago even if I was exclusively breastfeeding. Since that I'm pretty regular (cycle of 30days every times. Before I was irregular.) Now my son is on solid and I breastfeed too. My last AF was may 21th. I took a pregnancy test and it was negative and now I have ovulation look cervical mucus. 🤨

My son is cutting two teeth since 1 month and get up 2 or 3 times at night and only go back to sleep if I breastfeed him. Could it be the reason that I skipped my periods? Because he's breastfeeding more?

Thanks ladies!