What are the chances of getting pregnant with precum?

What are the chances of getting pregnant with precum? Also what if he already cummed the night before, took a shower just to relax without using soap and then had sex but pulled out...would there be sperm in his precum still even is it's 7-8 hours...

later?
Thanks

I've never analyzed pre-ejaculatory fluid in a lab, and I'm not sure if aunt donna has either, so all we really have to go on, are sources that we think might be reliable. I found two web sites to back my post up and one to back auntdonna's up. So it seems like even the professionals disagree.

Granted, the safe answer is - don't take a chance on it. And of course, be aware of STDs. But practically speaking, the chances are low, and there is no sense in worrying yourself sick over something that has a small chance of happening.

Here are the three sources - each complete with the relevant 'cut and pastes.'

http://kinseyconfidential.org/can-you-get-pregnant-from-pre-cum/

Sexuality and health educators often warn individuals that pre-ejaculate might have sperm in it and thus could cause a pregnancy.

Theoretically this is true, as there might be sperm that are still “left over” in the urethra from a previous ejaculation earlier that day or earlier in that same sexual session (either because of masturbation or sexual activity with a partner). Thus if sperm are “left over” in the urethra and then a man’s Cowper’s glands release pre-ejaculatory fluid, and it comes forth to the tip of the penis during arousal, then there is a chance that some sperm could be carried in this fluid and get into his partner’s body, if they are having intercourse without a condom.

Pre-Ejaculate Rarely Contains Sperm
That said, research that has examined the content of pre-ejaculatory fluid has rarely found sperm present in it. This does not mean that sperm is never present in pre-cum; it just means that it does not appear to typically be present.

In your case, since your boyfriend did not ejaculate in the days before your encounter, it is unlikely there were any sperm “left over” in his urethra. We can assume that though he did not ejaculate in the days before your sexual encounter, he probably did urinate, thus likely clearing his urethra of any sperm.

http://en.wikipedia.org/wiki/Pre-ejaculate

There have been no large-scale studies of sperm in pre-ejaculate, but some smaller-scale studies suggest that no sperm is present and thus pre-ejaculate is ineffectual at causing pregnancy.[1][2][3][4] It is likely, however, that pre-ejaculate which follows a recent ejaculation will contain sperm, as some ejaculate is always left in the duct after orgasm.[9]

http://www.mayoclinic.com/health/birth-control/AN00197

Can you get pregnant from pre-ejaculation fluid?
Answer
from Roger W. Harms, M.D.

Yes. Pre-ejaculation fluid may contain sperm, which means that a woman can get pregnant even when ejaculation doesn't occur within the vagina.

If he's urinated after his last orgasm, there will not be any sperm inside the precum, especially after all those hours. Precum doesn't contain sperm and comes from a different place.

The danger is assuming it's precum if it's really sperm.

Slim, use a damned condom.

Oh for God's sake don't listen to those other answers. Sperm are in every part of the semen. The primary lubicant (semen) must maintain a moist environment in the urethra and sperm goes along for the ride! When counted in the laboratory, the pre-ejaculate DID NOT have significantly fewer sperm. Do not have unprotected sex. Use a condom, it not only protects you from pregnancy, but also STDs. Yes, I know he tells you that you are his one and only and you believe him. I don't. Good luck and stay healthy.