Is it possible to get pregnant during the 4th day of withdrawal bleeding?

I suppose you are referring to the last day of taking the Vines placebo tablet. Placebo tablets do not contain hormones, are empty and replace the break in taking the drug. Due to the fact that they do not have hormones at the time of their intake, there is "withdrawal bleeding". Protection during placebo days is maintained when the patient uses the drug correctly and systematically, which also includes the timely start of the next package. If you do not start another blister, this situation is tantamount to skipping the tablet on days 1 to 7 (first row). According to the leaflet in this case: "If during the week preceding the skipping of the tablet there was intercourse, the possibility of pregnancy should be taken into account. In this case, contact your doctor." It is difficult for me to decide how you should proceed, because I do not know your health problem that leads to the withdrawal of Vines. I suggest you consult a gynecologist, if the continuation of Vines tablets is contraindicated, perhaps the solution will be emergency contraception. I enclose material that can be helpful: