One miscarraige can ruin pregnancy

I had a brighten ovum ( sac grows without a baby ) that resulted in a miscarriage in feburary. Mind, I give birth to a almost 4 year old 9lb baby at 18 and at 20 I delivered twins at 38 weeks induced, one was 7lbs 10.5oz and one was 7lbs 15.5 oz and I delivered all my kids naturally.. well me and my SO wanted a 4th and call it quits and that resulted in a miscarriage in feburary at 21. I'm now 22 and I'm scared to death of getting pregnant again that I'm trying to push myself away from wanting another but I know deep down that I want one more. I catch myself smiling at the positive tests on here hoping one day I'll get another sticky bean but I'm terrified. I've even considered getting my tubes tied because I'm scared my body cant hold a pregnancy now. Before my miscarriage in Feb, I had my nexplanon removed the previous aug (just 4 months before I got preg again) has anyone else felt like this? does it get better?