Should I chill out or?? Please read. A little lengthy but look at facts plz!

Hi. I posted about this awhile ago somewhere else may have been wrong group. Looking for some replies.

I have been kind of nervous about pregnancy for two months now.

FACTS :

•I had withdrawal sex in April (29) when I had missed a birth control pill (combination) but doubled up next day. Continued rest of pill pack regularly.

•Had a period but it was weird the first week of May. Lighter and more brown. Lasted 6 days.

• Tested a week after period. Two negative hpt.

•Tested a few days after that at Dr. office. Negative. Also nothing on vaginal ultrasound.

•Tested two weeks later (May 25). Two negative hpt.

•Had another period June (6) this one was completely regular and veryVERY heavy. 6 days.

•Tested a few days after it ended to be sure. One hpt, Negative.

•Tested four days after. One hpt, Negative.

•Tested a week and a half ago at Dr. office when switching to Nexplanon. Negative.

• Tested a week ago at regular doctor, Negative.

Should I stop worrying? I asked doctor for blood test but given the explanation he said it really wasn't necessary and a urine test was fine. I haven't had my period yet, most likely because I had Nexplanon inserted a little over a week ago.