What Are The Chances Of Pregnancy With Timed Intercourse And HCG Shots?

i had hcg shot 5 days ago which was 16th jan 2012 at 9.30am. I was told to have timed intercourse at least 10.30pm the next day and we did have intercourse before 10.30pm the next day. We also had intercourse for the 4 days in a row as told by the doctor. I have been having some mild cramps on left and right below my stomach. Why is it happening? The doctor said i had one matured egg i think around 20mm so thats why she gave me hcg shot and told to have timed intercourse and see how it goes and she told me i do have chances. I hope it happens for me this month as i had 2 previous miscarriage before this and it was normal pregnancy. This time i took clomid day 5 to day 9. Gonal f shots day 5,7 & day 9. Hcg injection was given day 10 of my cycle. Suppose to do IUI this cycle but was cancelled as 3 matured eggs is required for the procedure and i only had one matured egg around 20mm and doctor gave hcg shot said timed intercourse still stand a chance.