Preseed question...

My husband and I have been ttc for a couple of years, we were finally prescribed Clomid, only thing is, he works out of town sometimes. Well just so happens I'm suppose to bd on the 15, 17, 19, 21.... Could I use preseed on the 14 when he is ho because he isn't coming back home until the 19th or 20th!!!  Could it help? Or are my chances for our first round of Clomid out of the question??? Hopefully I ovulate later!