Had 2 periods last month now 6days late for the first, neg preg test but temp of 99.4 a week before the second period possible preg even with neg test?

Not sure I: completely understand this chain of events. Don't know when you have been sexually active. A pregnancy test may not show up as a positive a week before your anticipated period. Try taking the pregnancy test if you miss your period.

See below: Conception, as defined by the generation of a fertilized ovum, occurs within day or so of the sex. However, it takes about 3 weeks for the embryo to make enough HCG to produce a positive pregnancy test. Blood test may be done a day after a missed period. Home pregnancy tests should be done 4-5 days after the missed period. If the result is negative repeat the test in 4-5 days. Use first morning urine and follow instructions for the test carefully. If you do not wish to be pregnant, use contraception all the time, every time. You may consider implanted contraceptive, or IUD. Practice safe sex, if you have sex. Get HPV vaccine, if you are younger than 27 years.