Should I be worried??

So, my periods are usually pretty irregular - normally I’ll miss one every couple of months - but this time I’ve missed two, which I don’t think has happened before for me.

I know I’m definitely not pregnant because I last had sex more than 5 months ago and I’ve had periods between then and now. I’ve told my doctor about the usual times I miss it and they just brushed it off as an irregular period and told me the pill will help regulate it.

I did go on the pill for a while but when I was, I had intense chest pains so I’m no longer taking it.

I know the doctor is right but I’m worried it could me more than that. What if there’s genuinely something wrong with me?

Does anyone else have the same problem?