Not sure what to call this

Shayla
OK so me and my fiance haven't been "trying" so to speak. But we haven't "not" tried either. All my life I have had irregular periods. I've been pregnant 6 times and only one live birth. I had a stillborn my first pregnancy, two miscarriages, my daughter, and then this past November we lost twins. Starting in March my period has been so on time I can almost get it down to the hour and minute it will start. Well May my period decide to switch and start 4 days later and that's been the pattern the last two months. This app says I should start my period today but I didn't. So does this mean I will more than likely start on the 4th like I do every month? I kinda feel pregnant but I don't know if it's really being pregnant or my mind playing tricks because we want a baby so bad. I've taken two test and they were negative. But when I got pregnant with my daughter it took 3 months before I showed positive even tho my doctor told me at 4 weeks that I was pregnant. So would it be best just to go get blood done?? I'm so confused. I have a ton of emotions about all of it. Please help. If nothing else just words of encouragement lol