Im so sorry Jodie that your going through this again. My thoughts are with you. I know how hard this is for you especially after having so many pgcy's go FT. After my first 2 pgcy's that went FT, I m/c my next two. I couldnt understand it either, how could I carry 2 perfectly, then lose all of a sudden. Unfortunately the hospitals wouldnt check on why I was losing until I lost 3 in a row, so when I feel Pg again, I went and saw an OB who listened to what was happening and at first was going to have me have injections (clexane) but then decided that we try aspirin. Which I ended up carrying my bub to term. I have to take aspirin with each of my pgcy's now and finally found out with my last pgcy why. I am ANA positive, so there is a clotting disorder.
Talk to someone that can look into this for you and do some testing in ask if taking baby aspirin can help you if you decided to fall pg again. I have also found out that I should be taking baby asprin everyday even when not pg.

Please know that I am thinking of you sweety, Its a terribly difficult time your going through. loads of hugs.