I am 40 days late now, negative pregnancy test

[VeryWorried92]

Hello,

I am 40 days late as of today and its been 66 days since my last period.
I have taken around 10 home pregnancy tests and they all came back negative.
I have missed 2 periods now, I have seen a doctor but they wont do anything as they're saying home pregnancy tests are not wrong.
I swear my tummy is getting bigger and harder, I am pregnant.
I had nausea, headaches, sore breasts, I have been very tired lately.
My doctor thinks Im going crazy and it is impossible for me to be pregnant as it would show up on a home pregnancy test.
I am 21 years old, I have never had irregular period. I have been on contraceptive implant for 3 years and had it removed 5 months ago.
All my periods were regular.
The doctor want to give me pills to induct period but I am refusing to take them in case Im pregnant.
I dont know what to think, I am very confused and irritated.
Could I be pregnant or is there something wrong with me?

I had this a few years ago. Missed 3 months of periods. Several negative pregnancy tests. Went to several doctors and for lots of tests (was living in a different country at the time so was all private but an awful lot cheaper than private is in the uk). A scan confirmed I wasn’t pregnant and a trip to a gyno confirmed my period was soon about to start (4 months late 🤔). He put it down to stress and the fact I’d been exercising more (though by no means excessively working out and losing weight/dieting). All been normal since. I had been getting a lot of bloating too during that time.