Me and my fiancé have been ttc for about 7 months now

Me and my fiancé have been ttc for about 7 months now. This past week, I have been feeling extremely emotional, tired, horny, and nauseous. So I took a pregnancy test about a week ago and it came back negative. It's one of those first response tests that either shows a minus sign or a plus sign. When it came back showing negative, the minus was very faint. I showed it to my fiancé, we both made a comment about how faint it was, then tossed it and didn't really speak about it anymore. I got a little frustrated that we had been ttc for about 7 months with no luck. So, I was browsing on facebook one day and came across this app. I thought that maybe I'll try it out because it seemed interesting, and it would be pretty cool to learn about my body and how my menstrual cycle and ovulation worked in hopes that maybe I'll finely conceive my second child. I had the app downloaded on my phone for a good week or two before I finely decided to try it out. I did my log and all that only one time, went out and bought a basal thermometer and skipped doing the log one day because I wanted to start doing the logs with as much info as possible, because I really wanted to know when the absolutely best time to try and conceive was. Well, last night our little family was grilling and I had went inside to fry some fries. All of a sudden, I started crying out of the blue, so I told myself that either I'm pregnant or going crazy, and need to get help. Lol! So without telling anyone, I went to the bathroom and decided to take the second test, and sure enough, it came back positive!!! When I came out the bathroom, my fiancé was sitting down eating his dinner and I walked by him smiling like a fool. He looked up at me with a smile on his face and said "What"? I told him "We need to have a talk". "About what"? I took the test out of my pocket and showed it to him. He got this huge smile on his face and said "What is this, is it really true"?! Then he got up, wrapped his arms around me, kissed me with all the passion in the world and put his hand on my stomach. Needless to say, we are extremely happy and thankful. :)