Why am I having periods every 10 days?

It's difficult to determine the cause of the blood clot without a proper medical checkup. It's possible It could be a decidual cast, from the uterus during menstruation or after pregnancy. It's also possible that it could be a sign of a miscarriage or another medical condition. I suggest get it checked as soon as possible to determine the cause of your symptoms and get appropriate treatment.

A pregnancy test result of 41 mIU/mL means there is a possibility of pregnancy. This level generally corresponds to a pregnancy of around 4-6 weeks. Don't forget to come back for the follow-up to check if the level goes up as it should. This increase would confirm the pregnancy. Symptoms of early pregnancy can include nausea, fatigue, and missed periods. 

Yes it is safe for pregnant women to travel by air during the early and middle stages of pregnancy as long as there are no complications or medical concerns.

Getting vaccinate­d during pregnancy shields both mother and child from te­tanus. The tetanus toxoid injection typically occurs in months se­ven or eight. Even if de­layed till nine months, it remains worthwhile­. Tetanus results from soil-dwelling bacte­ria. This shot fortifies the immune syste­m against that microbe.

Since you had a delay in your monthly period, it may be a sign of pregnancy, but there are other possible reasons particularly stress and changes in hormones. To know that you are safe you could do the test only after the 14th of May and learn if you are expecting. Your cycle is subject to the effect of countless factors in various states of your body.