I know some of you are gonna tell me to take a pregnancy test but before i go waste some more money, I need your…

I know some of you are gonna tell me to take a pregnancy test but before i go waste some more money, I need your opinion. Me and my man have been trying since thanksgiving 2017 and we had no success. I decided to get an ovulation tracker and we had unprotected sex on every ovulation day including my most fertile day which is the 13th of April. Yesterday I experienced some light brown / pink blood and it stopped within a day. I'm really moody ,irritable , crampy where my uterus is and , my boobs are starting to get a little sensitive. Do you think it worked this time? Keep in mind that I have a normal period that lasts 7 days and me and my man come from very fertile families. We are 18