Chance of being pregnant. URGENT.

unless he actually cummed in your p***y , you are fine

With your last period start being 28th Oct, and the next due 25th Nov, Ovulation is likely to be 11th Nov (period usually stats 14 days after ovulation). As sperm cam live in an woman's body for about 5 days, you are likely to have been fertile 6th to 11th Nov. The 'dry humping' took place on 2nd Nov & 18th Nov, well outside those 'fertile' days.

However, that is assuming that ovulation was 'regular', which is not always the case. Whenever sperm reaches the vagina there is the possibility of pregnancy. So what are the chances of that?

To become pregnant, an egg has to be fertilised, which means a sperm has to get into your vagina somehow. If your boyfriend 'pre-ejactulated', then that fluid would have to get into your vagina. If he kept his boxers on, then the pre-ejaculate would have landed on his boxers. To get into your vagina, it would first have to first pass through his boxers. Sperm swim, they cannot walk or crawl. Therefore they need liquid to swim in. So the liquid pre-ejaculate has to pass through those boxers. The fabric is likely to soak up the liquid and leave the sperm therein stranded. Did you see the fluid on the outside of his boxers? Then, the sperm has to swim through the fabric weave. Small though sperm are, that is a challenge (but not impossible). Next it needs to swim into your vagina (I don't know how wet you were). So the chances of sperm (if it was in his pre-ejaculate) getting into your vagina are very slim. However this takes no account of any manual transfer if any got onto hands.

I hope this helps.

That is not true gangnamstyle!! Many virgins have become pregnant.

You probably wouldn't know. Pre-ejaculate is also called pre-ejaculatory fluid, preseminal fluid, or Cowper's fluid. It is also informally knowm as pre-cum. This fluid does not ejaculate as such. It is a clear, colourless, viscous fluid which comes (sometimes just oozes) out of his penis when he is sexually aroused. It may contain sperm, particularly if he has not urinated since his last semen ejaculation. If he had pre-ejaculation fluid, it seems strange that it would be "after he put his shorts back on" once you "finished dry humping", but if it was then, it would obviously not get in your vagina (without help!).