Talk

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I think it's unlikely tbh. You'd be about 6 weeks by now. Baby should have a heartbeat. Seems impossible for that to be the case when your hcg levels are too low to be detected.

Only possibility for a bfp is that you ovulated late. I was on cd39 when I got my first faint line. Do you know for certain when you ovulated?

I don't want to alarm you but ectopic pregnancies can give false negatives. See your GP ASAP.
www.ectopic.org.uk/patients/diagnosis/

You probably just ovulated late and so your period is due later than you think.

JLK1995 my period was 15 late before I got a BFP and I am now 23w 4d.

BUT I must have ovulated twice during that cycle because I know the date I ovulated before my missed period (I was doing ovulation tests) and based on those dates I should be 25wks pregnant now. When I went to my first scan I measured 13 days smaller than my dates and am only 23.4 as above so the only way that could have happened is if I ovulated twice.

So, in a long winded way I am saying you may still be pregnant if you have the symptoms but you may have ovulated twice or late. I would go to your GP, which is what I did as I was convinced I was pregnant despite the negative tests. They examined me to rule out ectopic and referred my for a blood test

Good luck