Sorry I'm not up to scratch on the different types of test , hopefully you are PG!! don't feel guilty.
I was lucky enough to Have three bubs from four tries (I had a m/c) between DS and DD#1. I also had spotting with both my DD's and this caused a lot of stress, I had to keep reminding myself to enjoy the special time and not to focus on the spotting. I hope you have a positive out come I'll be keeping an eye out.
Best wishes.