I am 21. I had sex on 21-23 of July. We used condoms. My periods were due on 3-4 of August. I did not get them either in August or in September. The urine pregnancy test (Preganews)which I did at home (I followed all instructions, and used the first urine) showed negative results in the second week of August and also of September. I have acne on my face, I am getting white vaginal discharge, muscle cramps in lower abdomen and also I am always tired. 

I have a case of hypo thyroid. For which I am taking medications.

Could I be pregnant?