It's perfectly fine, it doubles every 2-3 days normally. By the time your period would have come around it will be at 100-200 which is perfectly well within the normal range for 4 weeks pregnant.
Remember the range of what is normal is massive. The most important thing is that it is going up enough.
Good luck! NO worries, my first number was 42. Was really concerned as well...chose to wait for my 8 week visit rather than rushing back to make sure it was doubling...and sure enough the number rose to 140,660!!! As the other ladies have said, don't worry about the first number just that it is doubling and in the beginning it can be slow too....could take up to 72 hour to double. Congrats on your bfp!
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