Ovulation typically occurs five to 10 days after taking the last clomid pill. So if you took clomid on days 3 to 7 of your cycle, you are most likely to ovulate between days 10 and 16. If you took clomid on days 5 through 9, ovulation is most likely to occur between days 12 and 17 of your cycle. Ovulation can, however, occur even later than 10 days after your last clomid pill, so it's something to keep in mind.
If you were given a trigger shot, then ovulation will occur 24 to 36 hours after the injection.
Unless your doctor tells you otherwise, you should begin having sex every other day, or every day, starting three days after you take your last clomid pill, and continue having sex until you've confirmed that ovulation occurred. You may get confirmation from a body basal temperature chart or a progesterone blood test (usually given on day 21 of the cycle).
Are you doing an IUI cycle? Based on your ultrasounds and the timing of your trigger shot, your doctor will tell you when to come in for the IUI. In most cases, you can also have sex on your fertile days at home in addition to your IUI. (Think of it as extra credit!)