Beta hcg at 28 on 7.5DP5DT. Help ?

[Pre92]

Hi everyone. My clinic likes to test for beta hcg 9DP5DT. Unfortunately my clinic is closed on 9 days past hence they ordered a blood test the previous day. My transfer was late evening so I was technically 7.5 days past my 5 day transfer at the time of drawing blood and my result was 28.

I am retesting 48 hours later and hoping it doubles. Has anyone had a similar instance and gone on to have a healthy pregnancy ? I am so stressed and need some reassurance. Thank you in advance