Urgent 😰

Good morning, so my partner and I had sex but I started taking birth control from the start of the same month but sometimes I would forget to take it on time and take it couple hours late or have to double up e next day. So we had sex and the day after I bought plan B just to be safe but I was supposed to see my period like 4 days after we had sex and the plan B so I had my period plus bleed for couple more days after. Now I am 17 days late and I don’t know if it’s because of the plan B which they said can delay periods. I also took two pregnancies test and they came back negative. Should I still go to the doctor or I shouldn’t be worried?????