pregnant over 40 1st Fet with ICSI

Nenee • Mom of twin boys
Feeling thankful. Hope these babies stick. 
I'm 40 and my husband 34, I were married last June and started trying since. I got pregnant in October 2016 but lost the baby at 7 weeks. We started trying again with <a href="https://glowing.com/glow-fertility-program">IUI</a> in February and March but not succeed so we go for <a href="https://glowing.com/glow-fertility-program">IVF</a> because of my age, egg retrieval early May and ET the end of May. I live very healthy and exercise regularly, I'm in normal BMI, I only drink alcohol when socialize but limited to 1-2 glasses and only drink wines and I stop alcohol and coffee for almost 6 months already.
We got 13 eggs, 10 fertilized, and we freezes 10  at  day 2, They were all 4-6 cells embryo. On the day of transfered  we thawed 2 and both of them became more than 8 and 16 cells in 1 day so we put both in. I stayed home from transfer day till DPT 4, day 5th went out to lunch with family and day 6th back to work. 
Symptoms: 
1dp3dt , cramping, nipples hurt but they hurt before transfer already because of all hormones injection.
 2dp3dt-4dp3dt tender breast 
5dp3dt - 9dp3dt no symptom at all watery cm
10dp3dt spotting brown cover 1/3 pad 
11dp3dt no spotting watery cm
12dp3dt spotting brown not much I though af is starting 
13dp3dt no spotting beta 1500
15dp3dt beta 4000 u/s saw only 1 sac but Doctor said maybe more than one 
Now I'm 4 weeks 3 day feeling pretty normal except that my beta is really high. 
Vitamin I took before egg retrieval, 
Folic, Co Q10, fish oil, vitamin C, Prenatal, melatonin 1.5mg until egg retrieval 
After egg retrieval : folic, prenatal
After Beta : folic, prenatal, vitamin C, fish oil, And medicines that Doctor prescripe