Hey I started my period onn dec.1st and had sex on the 5th but my period usually last 10 days. It was protected sex at but the condom came off and I didn't know. I usually should ovulated on the 20th of dec.. What are my chances that I could be pregnant? It has been 15 since I had sex and so far I haven't had any symptoms. I'm due to have my period on the 1st of jan. Please help.

Unfortunately there is no way to give you a percentage. You will have to wait until your period is due. If it does not come when expected, take a HPT using first morning urine and be sure to follow the directions carefully.

Not sure what help there is at this point, according to your info, if you were tracking your most fertile days not just assuming when it was, you should be safe.

But there is just no way to tell till you miss or not miss your next period.