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Your question: "I had intercourse on 10 February.On 14 February I had symptoms like headache, backpain ,white discharge .it lasted till 19 february.On 18 and 19 feb I had blood spot along with white discharge during urination.From 20 february onwards I have no symptoms. But I didn't have my periods .My last periods was on January 23.I am taking euthyrox 25 mcg tablet for past 15 days.Am I pregnant

There is no way that we can tell if you are pregnant online. It sounds like you may have already missed your expected period though. If so, wait until about a week after your missed period and take a home pregnancy test, being sure to follow the directions carefully and use first morning urine. If you are not satisfied tat the result is accurate, schedule testing at your doctors office. I hope you get the result that you want.

It appears that one of the side-affects of Euthyrox can be a change in your menstrual period. Euthyrox - Side Effects, Dosage, Interactions - Drugs - EverydayHealth.com

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What are the possible side effects of Euthyrox (Levothyroxine)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have a serious side effect such as:

• fast or irregular heart rate
• fever, hot flashes, sweating
• sleep problems (insomnia)
• changes in your menstrual periods; or
• vomiting, diarrhea, appetite changes, weight changes

Common side effects may include mild hair loss.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects.

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You need to call your doctor and discuss possible side-effects of the medications.