thanks for using health care magic.
There is absolutely no chance of falling pregnant if the sperms of the
man does not get into the vagina. More so, the female has to be on
her fertile period before there could be any chance of fertilization that
would lead to pregnancy
. Sperms cannot reach the fallopian tubes for
fertilization through the mouth.
For the past months you have been having regular menses which will
not occur in a pregnant woman. Pregnancy is first thought only after
missing the menses. More so, your pregnancy tests
all came back
negative implying you can not be pregnant.
Hope this helps you. If you have further questions do not hesitate.