18 and already had 2 miscarriges

I have been with my fiancee for a few years now and just over one year ago we decided to try for a baby. nothing happened for the first six months however in december i fell pregnant, and on the 25th of January i miscarried. I have honestly never know any pain like it. We were both so happy because although we were only trying for six months it felt like a life time!!! especially as some people only have to have intercourse once and they fall pregnant. Around about the same time my friend fell pregnant but she decided to have an abortion. It is probably the most horrible thing to say but i really did and still do wish our situations were swapped over. We really wanted our baby. The emotional pain that accompanies a miscarrige is ridiculous. Our relationship took a turn for the worst because i wanted to talk about our loss because we had built dreams in the month that i was pregnant and spoke about general baby things as you would then our dream was snatched as well as our babys life. Although i wanted to talk about our loss my partner didnt. he used to make jokes about it as a way to deal with it, which was very hurtful on my part although i understood. eventually we spoke about it and he broke down and now we are on the road to recovery and are learning to deal with our loss. Then in April i was 2 weeks late on my period. i didnt want to take a test incase of putting bad luck on it. Sounds silly. But then i had almost the same symtoms as i did in january so i think i may have miscarried again. Then in July i found i was pregnant again however miscarried again...yes again, a few weeks into my pregnancy. We are both absolutely devestated and all we want is a baby. Never realised it would take this long. The emotional strain this has put us under is rather bad. I keep looking on websites to try and justify my miscarriges but nothing as yet has helped. So now...Mid september i am currently ovulating...fingers crossed. I know that sperm can stay inside a woman for up to seven days and that having intercourse in the seven days leading up to ovulation and during can increase your chances of getting pregnant. I am mid ovulation and today i woke up and was sick. I have been sick about 3 times today and also felt unwell yestoday and had a headache and back pain and have not been able to keep any food down and feel sick at the sight of food. Do you think there is a possiblity of another pregnancy?? I think about being pregnant every single day and we want nothing more than to have a baby. The more i want it the less it seems to happen. Do you think i should make an appointment with my gp and speak to him about the miscarriges? It sounds so silly but i have been putting it off because i feel ashamed...it was my baby and i failed to keep it safe. Maybe if i had done something different my baby would be here within the next month. Any advice would be greatly apreciated. Thank you