Can I fly if I think am pregnant or if am not sure? I've been feeling weird I cant sleep on my stomach and I feel tierd all the time

Yes. Yes you can fly when you are pregnant. They just warn those that are close to term not to, in case something may happen en route.
Yes. But if you are late in pregnancy -it might not be prudent -especially for long flights. Take a pregnancy test if you think you might be pregnant. Take care.