ABSOLUTLY BECAUSE EVERYONE'S BODY IS DIFF.
Lack of hCG, the hormone that is detected in pregnancy tests. If you test too soon after ovulation the test will be negative, waiting a week or two will allow enough time for the hormone to be present.
Yes and no. All home pregnancy tests are decting the same hormone, HCG, a hormone that is produced by the developing placenta. However, all home pregnancy tests do not detect HCG at the same levels. So some brands may show positive results sooner than others.
If it doesn't give you a positive answer the best would be going to the doctor and get tested there.
Growth hormone and others I can't think of.
Not always. Colostrum can leak from your breasts at any time. Pregnancy or not. Hormone changing can make you leak a little big of colostrum. Some women will leak more then others, especially if they've already had children.
medications w/ certain hormones can cause false positives or negatives. and certain pregnancy tests are better than others. i recommend seeing a dr.
growth hormone
growth hormone GH
I am guessing by this question that you suspect pregnancy but have had negative results. Perhaps I shouldn't guess at it though. I will say it varies the first month after conception. Some show more than others. Also taking a test when urine is most concentrated, such as when first waking up, will prove more effective in detecting HCG.
oxytocin
Taking a test during implantation bleeding would not give you an accurate result, your embryo doesn't start producing HCG (pregnancy hormone) until it is implanted fully, then it takes a few days to get into your urine, that is what the pregnancy test is looking for. I'd wait 3-4 days. Sometimes it takes up to 2 weeks after implantation to get a BFP. Some women don't produce HCG as fast as others.
Yes, it produces hormones. for example FSH and LH- in a female bodyCheck out this website for more information:http://www.becomehealthynow.com/article/bodyendocrine/733/Hope this helps! :D