Do I calculate ovulation day based on my last cycle

Comments please & thanks!

My last cycle due to miscarriage was 26 day cycle. We started TTC this month so I’m not sure to go by my last cycle OR assume a regular 28 day cycle. If I go by last 26 day cycle, I ovulated on the 4/5 of January but otherwise if I assume a 28 day cycle more like the 8th! Thoughts please & thanks

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