7 months PP, weird cycles.

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My little one was born the day after Christmas. I breastfed for awhile but stopped because my supply dropped. I’ve had two cycles since then (April & May) Both we’re 31 days. My cycles prior to being pregnant were irregular but I’ve never been this late or just skipped a cycle all together. I’m currently 27 days LATE. I’ve taken two pregnancy tests, both negative. I made a doctors appointment but it’s not for another week & a half, that’s the earliest I could get in. Should I ask for my hormone levels to be checked or anything? It took me and my partner 5 years-ish to have our baby. I’m scared something may be terribly wrong.