My husband and I have been TTC our second child since 2007. We are getting pregnant without treatment but seem to have the problem of keeping the babies. Brief pregnancy history and then a summary of what is going on with the pregnancy. Can anyone give me any hope?

2005 Normal pregnancy / delivered healthy boy
2007 Went into labor and delivered baby boy at 20 weeks. Sadly it was too early for him.
2008 Early miscarriage
2009 Early miscarriage
2010 Early miscarriage
2011/2012 Pregnant and not sure where this is headed…

My current pregnancy:

12/01/2011 Intercourse (Day 11 of cycle)
12/04 Inter course (Day 14 of cycle)
12/13 HPT - Negative (Day 23 )
12/16 HPT - Negative (Day 26 of cycle) spotting
12/17 HPT - Negative (Day 27) spotting
12/18 Light Flow (Day 1 of cycle)
12/19 Normal Flow
12/20 Normal / Light Flow
12/21 Light / End Period
12/27 HPT - Positive
12/28 HPT - Positive
12/29 HCG - 386
12/31 HCG - 486
01/02/2012 HCG 484
01/03 IV U/S elongated gestational sac (Day 17 of cycle)
01/09 HCG 600
01/10 IV U/S gestational sac disappeared (Day 24 of cycle) ( dr. said to prepare for a miscarriage. I opted to miscarry naturally)
01/17 HCG 1998 (Day 31 of cycle)
01/18 IV U/S small round sac detected in uterus (multiple ultrasounds to rule out ectopic pregnancy. Dr. said sac might be pseudo sac? asked me to come back in one week)

Was the initial sac seen on 01/03 a vanishing twin? Once that sac disappeared can a second sac start increasing HCG and/or start developing normally? Is my LMP considered 11/21 or on 12/18? I have not had nor do I have any cramps
or bleeding throughout this timeline. I have felt simply pregnant. My breast tenderness comes and goes. If I can go by 12/18 LMP it seems my dates and numbers are ok but if I must use 11/21 as LMP it seems less likely it would be viable. If I had not taken a HPT on 12/27 I would just now notice a missed period as I had 5 days of bleeding right on schedule for my period in December. But was that implantation bleeding? So so confused.
Does anyone think this pregnancy is viable based on the information I am able to provide? I am desperately holding on to any small percentage that a normal pregnancy will develop from here.

Im sorry you are going through this hun. Its possible for hcg to decrease and then increase with vanishing twin. However, on the 9th you would have expected hcg to resume doubling every 48 hrs since the sac was gone on the 10th. Your beta from 1/9 and 1/17 puts doubling time at 110 hours. Im sorry but it doesnt look good. Ill say a prayer for you and hopefully you can get an answer soon.

Liza, from your hcg numbers it really isn't looking good but I couldn't say 100%. It sounds like your doc is worried about an ectopic and monitoring you for this.

As for your multiple losses, have you ever been tested for a reason? Did you find out why you lost your second baby at 20 weeks?

If not, and if this pregnancy does not turn out viable (sorry, I hope you don't mind me saying), I would urge you to pursue testing for recurrent miscarriages. Usually, there is a reason for so many losses and that reason can be treated.