Possible pregnancy? Started pill pack 6 days late

My pills are 24 actives, 4 placebo (yaz), my last pack's placebo pills started on 29th Oct, withdrawal bleeding started around 31oct/1st nov, supposed to start new pack of active pills on 2nd Nov, but only started 5/6 days later on 7/8th Nov. During which, had sex with boyfriend on 3/4th Nov, came inside, as well as 10th and 11th. Missed 10th’s pill and was late for 11th’s pill, took both pills on 12th’s morning at 6am. Could I be pregnant? I have no idea if i ovulated cos i started my pack late, anyone knows how to calculate? when is the earliest i can test without waiting it out? I tested this morning and it was negative, had light cramping today, just came home from work and found out that I spotted!