<s>[INST] Hello doctor,I took a small amount of cocaine two days ago. I do not take it regularly and the last time I used it was two and a half months ago. My fiancée and I are about to start trying for a baby. I thought that the cocaine would be out of my system in a week, but after research, it looks like it can stay in the sperm for longer. When is it safe to start trying to conceive so that the cocaine is not going to affect my sperm? Or will the small amount of cocaine I took have no impact? I used less than one line. Thanks. [/INST] Hello. How are you doing? Hope I have clarified your query. Do write back if you have any more queries. All the best. For further queries consult an obstetrician and gynaecologist online --> </s>