Thanks for posting
If you missed your period last month and presenting with signs of pregnancy
as you said then it is likely that you are pregnant but that has to be confirmed first by doing a pregnancy test early in the morning. It is possible to be pregnant and bleed. The bleeding could be normal gestational bleeding where as it could be the pregnancy that has complicated into a spontaneous abortion/miscarriage
. if the bleeding is not continuous, it is still advisable to do a pregnancy test and if the test is negative, then just sit still and observe if any other episodes of bleeding so you can then see the gynobs to present the situation.
Also do not be shy because of your age to present the situation to your parents or visit the hospital as your situation might get critical and life threatening too.
In the future to practice safe sex
which also help prevent possible STDs ( as STDs had been shown to significantly correlated to early sex).
Hope this helps