If you've had intercourse lately, and think that might be the cause if you're not sure your tubs are well-tied, then may I suggest you do a home pregnancy test.
No matter what, it's best to reassure yourself by visiting your doctor in the very near future.
It is possible that tubes that are just tied and not cut, can become 'untied' and from there, anything could happen.

Good Luck, and keep us posted.