Hey! I'm new here and recently found out about my pregnancy early this week. It's my first!
If there's chances you see positive, I guess you are confirmed pregnant! That's a good news really.
1. HCG blood test is accurate.. I did mine when I was still very early.. figure was 150 then it doubled to 300 the next 2 days. If the result come back to be above 25mIU/ml then yes you are pregnant.
2. In April you should be in your trimester 2.. no issue traveling and safest I bet.. Lots of my friends traveled for babymoon during this time. Provided no complication and doctor say you are good to go. Near to end of third trimester airline would not let you fly because they worried woman who went into labour on flight.
3. I guess if I'm you I would keep it to myself till 1st trimester ends and everything is stable. I think would be protected if you announce your pregnancy within 6 months from confinement (Someone can correct me if this is not right). If you have a understanding boss maybe you can let them know first? or just wait till your tummy show and they find out themselves.
4. All the best! Just let find out whatever you can and reduce your worry due to uncertainty. I was once like you