hii mam,
**About Home Pregnancy Tests

Home pregnancy tests are usually about 97% accurate, but this varies from brand to brand. In order to get the most accurate results, it is a good idea to wait for about a week after your missed period . This allows more hCG to build up in your urine, which will allow for a more accurate test. Some urine tests can be used on the first day that your period is due, however, it is unlikely that you will achieve that 97% accuracy rate if you test so early. It is best to perform a urine test in the morning, before you drink or eat. This will allow for a buildup of any hCG in your urine.

HCG is called pregnancy hormone and as long as time goes,its positivity will increase.

So dont worry,do immediate pregnancy strip test and call your doc.

All the best.

hii mam,
"COITUS INTERRUPTUS or WITHDRAWAL METHOD" is the term both of you have practiced.In it pregnancy rate is nearly 25 per 100 woman years.Main cause not due to ejaculation inside the vagina but the prostatic fluid secreted prior to ejaculation,frequently contains active spermatozoa.
So failure chance is great.

Your cycle is normal and you are on 41st day after your previous period ie 17th day of missed period.
You need to do a urine test for hcg immediately along with a blood test.
If both are negative,then do a usg for confirmation.

And if your pregnancy test is positve then do a usg for confirmation of uterine pregnancy and duration.
If you want abortion,then protocol as follows

Day1:600 mg(3 tabs) of Mifepristone(RU-486) given as single dose and woman is observed for half and hour and then allowed home.

Day3:400 microgram oral Misoprostol is administered(2tabs) unless abortion is occurred.

Day14:Follow up to confirm abortion has occurred.
If not surgical MTP is done.

Bleeding usually starts wiyhin few hrs of taking RU-486 and abortion is done in a week.

**Single effect of Mifepristone for abortion nearly 83% and addinng Misoprostol with it nearly 95% in less than 48 hrs.

All you need to do under supervision of gynaecologist.

All the best.