Pregnancy or not. Thickness6mm!

My Gynae prescribed me ovral-G tablets for painful periods.started 1cycle from 15Nov.the 9th day of my periods in Nov.l sexually involved on 1Dec.didn't had penetrative sex,genital contact or ejaculation near or inside vagina I gave him  blow job while wearing condom but I don't know if there was presence of semen on his hands or clothes while disposing off the condom and after that he fingered me and I grinded up on him naked but he was wearing clothes.On 4Dec.completed 20day course of ovral-Gwithout missing any pill.On 10Dec.l started to have bleeding  like periods only there were little cramps too.But the flow was very less and scanty filling less than half of sanitary pad on the first day.bleeding continued till 15Dec.reducing  each day.2nd cycle of ovral-G from 14Dec-2jan withdrawal bleeding same as first cycle from 8-11jan 3rd cycle from 12-31Jan same amt.Of bleeding from 6-10feb.Igot lower abdomen ultrasound on11feb which showed empty uterine cavity with endometrial thickness6mm