Precum, fingering, and birth control. Could she be pregnant

My girlfriend and I do not have sex, but we do engage in manual stimulation. Just recently when we were intimate, without thinking I wiped a small spot of precum off the tip of my penis. I did not wash my hand, but I did wipe it clean several times with a dry towel. About five minutes later I fingered her. She is on the birth control pill and has not missed a day but was a couple hours later than usual in taking it the day before. Her period is supposed to start in 2 days, but today she experienced slight bleeding for a little while but it stopped. I need to know what the chances are that she is pregnant from precum.