Hi Worried.

Technically, yes, it's possible to get pregnant from precum, the fluid that you can see at the tip of the penis. I think something like 10,000 inidividual sperm live in one drop of seminal fluid. Those little suckers are persistent. And technically, you can get pregnant at any time of the month .... depending on the length of your menstrual cycle. From the sounds of it, your cycle is quite long and varies from 28-56 days. Is that correct?

Pregnancy occurs most frequently when women ovulate, which is approximately 14 days before your next period comes and you start to bleed. I'd suggest that you test for pregnancy and then keep a calendar to track your periods. You might notice a pattern and can then plan for when you have sex. Although this method isn't foolproof, it's better than guessing!