I was having SEX with a random guy 6mos ago. Only had vaginial SEX once. While we were having SEX I turned around to make it easier for the guy to enjoy. When we both were done as he pulled out we both he and I noticed the condom was not in he penis. I looked on the floor still nothing!! At that point I'm freaking out panicing for my life. I then put my finger up my vagina and felt the condom then carefully pulled it out. This has never happened to me before. I'm sure the guy cum in condom as I looked at condom it had sperm inside it. However I have no ties with this guy and here I am6mos later still worried. Keep in mind after that pre exposure I did go get tested for hiv 2days later. So at least I'm sure I was hiv NEG at that point and prier time frame. It has been 6mos since then please be forth coming straight up with me. Should I be worried what should I do. Also I have had mild headaches off and on.