Should I test? 🤷🏻‍♀️🤷🏻‍♀️

My little boy is 8 1/2 months old and iv have a period since he was 2 months, they used to be round about the same time before I had him but they now have been round about a week or less late, I don’t remember when last months period was but the month before I came on on the 5th so I think the next month I came on about the 10th?.. so it’s now the 15th of this month and I feel fine nothing different but I felt like that with my first I didn’t have no sickness nothing, I keep telling my self I would know the second time because I just got lucky the first so do I waste money on a pregnancy test or just wait it out a little longer? I’m also not breastfeeding