Scared to buy anything

So this is my second pregnancy. The first one ended with a mmc that I found out about at our first ultrasound at 11+4. Today I'm 8+2 and had an ultrasound one week ago and saw baby measuring 7+2 with a heart rate of 147. We were super excited about this because we never saw a heartbeat in our last pregnancy. Last time I started buying stuff right away and I'm afraid I jinxed us! Currently I could use a new bra because my current ones are getting a little tight, but I'm too scared to buy anything and jinx myself again. I know we saw the heartbeat but I'm so nervous. Like my nausea seems to be letting up and my boobs don't hurt anymore like they used to. Uuuuugh. pregnancy is stressful.