I had sex july 17, it's June 24 today. After having sex with a condom I got my period 14 days later as expected which lasted 7 days which is normal. 13 days after my period ended I started getting very light spotting but it was so light I looked over it but yesterday I had a one day period with a few blood clots and brown in color. Could I be pregnant? I'm very worried? Any advice would be greatly appreciated, thank you