Ah Deni - i've had a bit of a hoot reading this.
Someone is either telling porkies - or they got pg before he left and didn't realise it was the right time.
If you were going to miss O time for a while i think you could see a FS and they could get some of DH's sperm to use while he was away.
You can be like me - get pg without DH being within a mile of you!