I am in the same boat as you. We were ttc for 2 yrs when I eventually fell pregnant last October to then miscarry in December. When I missed my period in Feb, I couldn't even bring myself to do a test - I had convinced myself that I couldn't lose anything if I didn't know I was pregnant. As I had stopped alcohol and was still taking vitamins there wasn't anything more I could do if I did know.
Since I plucked up the courage to test, we have just taken it one day at a time, telling ourselves that this is a new pregnancy and there is nothing to suggest the same will happen again. Even when the mc risk is greater, the majority of pregnancies still result in a healthy baby and just keep focusing on that.
I did have a private scan at 8 weeks (just after the point where I lost the first time) and we saw a heartbeat. Now I just keep going over the fact that 97% of those who see a hb at 8 weeks take home a baby. The fear that I could be one of the 3% is always going to stay with me but when I feel most vulnerable, I just keep telling myself that statistic.
I completely understand what you mean about admitting it is actually happening - I didn't tell GP or do a midwife referral until after my scan. This is the first time I am posting on here that I am pregnant as I am so anxious I will jinx it, sounds stupid I know.
Have a scan if it will give you reassurance - I kept fluctuating between wanting one for reassurance and not wanting to know if anything was wrong. We were going to Europe for a short break so I eventually decided to have one just before we left for peace of mind