test have come negative twice so it looks highly unlikely that you are pregnant.
Your symptoms may or may not be related to pregnancy.
Your heart beat and BP seems alright.
Home pregnancy test kits are quite specific unless you have done the test wrong. So if they have come negative twice then it seems u are not pregnant.
But it can be confirmed only with a blood test
of Serum hcg
levels or a ultrasound
. Hope u have done that with you blood test and u are waiting for the same results.
Take care and all the best.