Got BFP a week ago and still haven't told DH! Help?

So heres the deal. I found out on the 26 that I got my positive., Iwanted to tell him then, but thought. "ill wait for the first Blood draw to make sure levels are going up." I got one on monday. hcg was 47-13/14dpo, then on wed it was 143-15/16dpo then on last friday was 237-17/18dpo. I hope these numbers look good and normal. The other reason. The past week, on and off I've had days of brown discharge. never any red. maybe pink the first day I saw it and that was so little I had to look. Sorry tmi.only one day was it panty liner worth all the rest is once a day when I wipe, maybe. All these reasons I am scared to tell him. We have been through so much and I have this DUMB worry if I tell him I will miscarry , or why tell him, if the first ultrasound is no good. Heres the other thing. He leaves for a business trip on the 13 to the 17th. I almost just want to take him to the first appointment and on the way tell him what its for! Like a suprise. Now I can do this the friday before he leaves the 11th I would be 5w2d or the friday he gets back 6w2d. I almost want to do the week before because I am a worrier. What do you guys think? A lot I know! lol