I am 32 year old married. We are trying for a child. We had intercourse on Monday night, by Tuesday the egg size was 18 mm, we tried for intercourse on the same day night, but couldn't perform because penis become very small, I couldn't penetrate. Please suggest me what shall I do. We are so desperate to get a child. Please tell me whether to undergo sexual intercourse today also. If the problem arise again, what precautions I have to take. Please suggest me.