For those that have followed my story and provided support, I wanted to give an update. My betas have continued to rise but not double, and yesterday at 5w0d I had an early u/s. They did see what they are assuming is a gestational sac in my uterus and nothing in my tubes, so the chance of ectopic has decreased significantly - yay!
My beta yesterday went from 248 (19dpIUI) to 577 (21dpIUI) which is the first time it has actually doubled. This is totally confusing! The doctor did say the greatest probability is m/c at this point, but I have another u/s on Monday to see if either the sac has grown or there if they can see a fetal pole. I will continue to get my hcg levels checked every 48 hours until then.
So...still in limbo with little answers. I am willing myself not to get my hopes but sometimes its really hard.

After 3 failed Clomid+TI cycles, DD was conceived with IUI#1
TTC #2
Clomid 50 mg + IUI#1 = BFP, m/c and D&C at 7w1d
Clomid 50mg + IUI#2 = BFN
Clomid 100mg + IUI#3 = BFN
Lupron + Follistim + IVF#1 = 11ER, 10M, 10F, ET of 1 expanded BBA 5-day blast, 2 Frosties. BFP! Beta 10/13 = 264! Beta 10/15 = 702! EDD 6/21/14
Re: Another Update
"Just keep swimming, just keep swimming..."
BFP 1/21/13, blighted ovum m/c 2/12/13
BFP on Cycle 14--TWINS! Identical twin boys stillborn at 19wks(1/9/10)
3 break cycles; took clomid 50mg, BFP #2 Beta #1 35, Beta #2 338!!! Owen was born 2/11/11!
TTC#2: 4 cycles on clomid: BFNs
BFP #3: Cycle #5 100mg clomid; beta #1 21; beta #2 6=CP
Cycle #6 break cycle TTC no meds=BFN
Cycle #7: 150 clomid+ovidril+IUI=BFN (switched to RE)
Cycle #8: follistem+ovidril+TI=BFN
Cycle #9 Forced break due to cyst
Cycle #10 follistem+ovidril+TI=BFN
Cycle #11 follistem+ovidril+TI=BFN
Cycle#12 Forced break due to cyst, went on BCP; did repeat HSG, Saline U/S
Cycle #13 IVF: Follistim/Menapur ER 11-30 11 eggs, 5 mature, 4 fertilized and 3dt on 12-3; BFN
Cycle #14: IVF#2 lupron/follistim/menopur ER 1-22, 19 eggs, 14 fertilized, 5dt on 1-27, BFP!! beta 1: 63, beta 2: 119; EDD 10-15-13; 1 frozen embie
Me: 42. DH: 46.
1st Pregnancy: MC, 11/19/00.
2nd Pregnancy: DS born 04/10/06.
3rd Pregnancy: CP, 03/11.
4th Pregnancy: MMC, D&C 11/30/11, Genetic testing revealed Trisomy 4.
5th Pregnancy: Ectopic, 2 doses of Methotrexate unsuccessful, surgery 4/10/12, right tube removed.
Tried Letrozole January 2013-July 2013 (including 2 IUIs), all BFN. After 2 1/2 years of trying for child #2, decided to "give up" after July cycle, based on AMA.
August 16, 2013: BFP our first month of "not trying!" Still in shock. Beta #1 (14dpo): 183. Beta #2 (17dpo): 611. Ultrasound 8/30/13: baby measured 6 weeks, 1 day, heart rate of 118 bpm!
Ultrasound 9/13/13: 8 weeks, heart rate of 176!
Baby is due 4/26/14