Not sure what to do

So I am someone who can easily speak for others and also have my way with words but I don’t know how to always deal with situations in a healthy way. I give advice but I can’t take it. I am currently in a situation where I actually do need serious support. I am sexually active and I don’t utilize condoms but I am careful. I was at first late by a week or so, so I took a test and it came out negative and haven’t really been having any intercourse with my partner since then. Now, 47 days into missing my period, I am worried. Keep in mind that I am still a minor and I am very very afraid of what could be the possibilities. If you can provide any type of advice than just “use condoms” or “be more careful” and actually give me some really great words of advice, it be much appreciated.