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Whoever reads this post, please help as best as you can and give me any information --
this story will be semi long, and what i need to know is when was my probable dates for ovulation, when did i most likely conceive, and who most likely is the baby's father.


Ive been with my boyfriend for about 3 and a half years, in the beginning of this year we decided we would start trying to have a baby. We have unprotected sex probably 2 times at the least to 3 or 4 times at most a week.
My last date of my period was March 9th, 2007, and from past history my cycle usually lasts between 31-34 days, 35 at MOST but usually that never happens.
However, on the night of April 1st 2007 i had unprotected sex once with a guy who i had recently met, and now im unsure of who my babys father is. Im not sure if this matters, but the guy who i had the one night stand with drinks and smokes constantly, not just cigarettes but sometimes weed and i didnt know if this mattered. My boyfriend never smoked anything or drank anything in his life.
I found out i was pregnant on April 10th or 11th, and according to my ultrasound my due date is December 13th.
Im scared to death of having a DNA test done, because i dont want the other guy to be the baby's father, nor do i want to ruin anything with my current boyfriend/future husband.

so who is most likely the babys father?? and how much of a chance is there that the other man is the babys father? when were my probable dates of conception? and when did i most likely ovulate?