Miscarriage for #2

Anybody decided to try for #2 because you decided to have sibling for one & only child. Been trying not trying and would BD on the days that you are fertile and ovulating then nothing really happens for a very long time and just couple weeks you found out and just in complete shocked that you are actually pregnant and just the thought really? Then miscarriage 3days after the positive test. Anybody? My ever 1st pregnancy was a loss as well then my third. Or maybe my age now too or my body just in shocked.