I got a BFP but I can't stop testing.

I am 13 DPO today. I have been getting positives since the 26th. I am really excited, this is our first baby. I had a very early chemical pregnancy last month. I took a test, it was positive one day and negative the next. I am really afraid that I'm going to lose this baby. I have been testing everyday to make sure the line is getting darker. I have also been googeling chances or MC and things I know I shouldn't be looking up. I need advice. I have a doctor's appointment on the 8th of April, is it okay to test every 2 days? Or should I stop testing ?