I feel like glow is wrong...

So I’m trying to figure out how long my cycle is. My “period” (bleeding because of a miscarriage at 6 weeks) started May 24, then I got my period on June 24. So how long is my cycle? I feel like I should start my next period on the 24 of this month right? We decided to just BD every other day for this month, but I’m going to be out of town the 19-21 so I’m worried that I might miss my ovulation because I don’t want to track with OPKs because it caused so much stress and pressure.