Chances of pregnancy are less because you had taken the white pill. Missed periods and changes in mood are the earliest symptoms of pregnancy. The area around your nipples turns dark. Tiredness, nausea and vomiting, sometimes referred to as morning sickness, ranging from queasiness to severe vomiting that can manifest just in the morning are also early symptoms.
If you notice these symptoms then chances of pregnancy are there. In that case, get your serum HCG levels checked. It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
It's unlikely you will get pregnant from this incident, especially since you used a condom. I wouldn't worry about this and just be more careful in the future to watch what you're doing. Take care.