I always had regular period and I am not on the pill. My last period started last 19 August. A few days before my period, I had unprotected sex with my boyfriend. He could have gotten some inside me before he withdrew. I feel tired, a bit nauseous, irritated, bloated and sore breast lately, so i am worried i might be pregnant. I took a test the other day and it was negative at first, but later that day, i saw a very faint positive line on the test. I took another test the next morning and it was negative. So could i be pregnant? i am also due for a outpatient surgery to remove a fibro-adenoma on my breast and if i am pregnant, will that have an effect on the baby?