2006-10-08 01:00:29 · 10 answers · asked by dark 1 in Pregnancy & Parenting ➔ Pregnancy
First Response says you can test up to 4 days before your expected period. It tests for an Hcg level of 25mIU/mL in the Urine. The lower the mIU/mL the more sensitive the test is. Many pregnancy test are 25mIU/mL, 40mIU/mL, 50mIU/mL 100mIU/mL.
It will not be 99.9% accurate 4 days before your period. This percentage is IF the levels of Hcg < pregnancy hormones> are at the levels it is looking for. It is only about 69.9% accurate at 4 days before your period.
Some females do not even reach 25mIU/mL until a week or two AFTER their expected period.
I just found this all out. I missed my period on Sept 5th and I am NEVER late. All my pregnancy test were negative even the ones that stated you could test as early as 4 days. My levels of Hcg were just too low to detect even by first response.
Below is a link to different pregnancy test and their hcg level comparison.
If you want to TRY and test before your period use one that is 20mIU/mL to no more than 25mIU/mL. The best time though to test is always after your period. The levels of Hcg doubles every three days after your expected period.
I have also included a link to show the levels of Hcg each week of pregnancy. Starting from the week of your last menstrual period. As you will see, some pregnancies will not reach 25mIU/mL till week 5 which is a week after your expected period.
Good luck!
Hope this information helps like it helped me!
2006-10-08 01:23:57 · answer #1 · answered by FerymayGirl 3 · 0⤊ 0⤋
I got a bfp 3 days before with Answer brand tests. All the other tests were negative at this point including Clearblue & First Response. Answer are the best u can buy dont waste money on other ones and use morning pee. Good luck xxx
2006-10-08 09:06:52 · answer #2 · answered by Bubbles 3 · 0⤊ 0⤋
I found out 11 days into it, but not everyone can. I used the Answer brand home test and got two very distinct pink lines, several times because I didnt' believe the first one! Good luck to you.
2006-10-08 10:38:04 · answer #3 · answered by justwondering 5 · 0⤊ 0⤋
5 days
buy a first respond test
or go to the pharmacy you will see the tests you can read snd the get the correct one
Good Luck
2006-10-08 09:09:19 · answer #4 · answered by waiting for baby 6 · 0⤊ 0⤋
There is a new one that lets you take it 5 days before your period is due (It's called "First Response", I think). All the other OTC tests are not accurate until your period is due.
Blood tests are accurate 5 days after you had unprotected sex.
2006-10-08 09:02:12 · answer #5 · answered by jimbell 6 · 0⤊ 1⤋
my ob says wait until the day you were supposed to get ur period. alot of tests have evaporation lines which can give you a false positive. also supposedly clearblue easy is the most sensitive brand and will give the most accurate results
2006-10-08 09:01:02 · answer #6 · answered by Jen J 2 · 0⤊ 0⤋
14 days
2006-10-08 08:19:56 · answer #7 · answered by shazz 4 · 0⤊ 1⤋
check the preg test. in aus we have 5 days before your missed period. but most are from your missed period day.
each one is different, just go to the chemist. they are all easy labeled
2006-10-08 08:06:13 · answer #8 · answered by huney_mumi 3 · 0⤊ 0⤋
there are some test that can tell you 2 days after you have sex
2006-10-08 08:04:25 · answer #9 · answered by cochranfam1@verizon.net 1 · 0⤊ 1⤋
I waited one week after I was suppossed to have my period. It came back positive and it was right =)
2006-10-08 10:08:39 · answer #10 · answered by Me Myself & I 1 · 0⤊ 0⤋