Pregnant after stillbirth

Ashley • Astrophysicist TTC @ 33. Oliver & Alessa born/passed Sept 2008. Emma born Aug 2010. James stillborn Jan 2015. Sarah born Jan 2017.
Our son was stillborn at 34 weeks in January 2015 after a silent placental abruption. Afterwards I had six simultaneous pulmonary embolisms, so they assume a clotting disorder, but 9 months of testing has yielded nothing. I was also diagnosed with neurocardiogenic syncope, so I'm in a wheelchair a lot now. We also have a 5yo daughter and lost twins at just under 20 weeks in 2008.
After months of trying, we got a surprise BFP this morning at 8dpo! Due in mid-to-late May. We are nervous, excited, and anxious. It's been a bad year for us, so I'm convinced something will go wrong. Please send healthy baby vibes! (And if you have words of comfort about Lovenox, I'd love to hear them, because I'm terrified!)