Advice please! Conception not during ovulation??

Sarah • TTC since April 2016. MMC #1 Sept `16 MMC #2 Jan `17 Ectopic and Tube Removed Nov ‘17
Has anyone got any experience of this? Or have any advice? We had sex on CD 10, 11, 14 and 15 and I was due to ovulate CD 16 however he went on deployment that day. I've not tested for ovulation this month because he wasn't here to BD so there wasn't much point wasting the tests. Now on CD 21. Anyone managed to conceive NOT having sex in the 'ovulation window'? 
Thank you :)