### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
Hi I had sex on May 3. We used a condom and I am on birth control but I don t always take it the same time everyday. I got my period on May 24. Well my period this month was light but I still was able to use a tampon. It was mostly brown with some red mixed in. It was heavy enough that I would need a tampon sometimes but other times there was nothing at all. I took a test before I got my period and it was neg. I took another one today on May 29 and it was neg. I am feeling dizzy today and nauseous with fatigue. Could I be pregnant ? Is this implantation bleeding?

### output:

Hallow Dear, I gather from your history that you have sex about 21 days before the menses. It is very unlikely that sex on this day would lead to pregnancy. Moreover, you are on regular birth control pills though the timing everyday may be variable. However, the bleeding during the so-called period was brownish and scanty. So the possibility of pregnancy has to be assessed. Seven days after (?) missed period, pregnancy test gives reliable result. Though the first test you performed was too early to be reliable, the second test was after five days. It is also negative. So the chances of pregnancy are practically nil. Still I would request you to perform pregnancy test on overnight sample of first morning urine sample afterv4 days again. If this is also negative, you are not pregnant. You may go for ultrasonography to rule out blighted ovum in aborting process. Mostly this appears to be less bleeding due to hormonal imbalance. If you are taking progesterone dominant pills, they can cause such a low bleeding. If you do not get regular bleeding after one week, please report to the Gynecologist.