Another miscarriage

I was supposed to start my period on the 9th but didnt start.. i had takin 6 hpt an they were negative.. but still hadnt started my period. So I went to my obgyn on the 11th to get a blood test done... then next morning I took another htp. It was positive. The second line was there but it was a faint line. Later that day I got the call from my ob Dr they said my hcg levels were 14.36 so it was positive for pregnancy.. they told me to come back a week later to see if my nubers would double.. I starred bleed on Monday the 16th so I went to get the next blood test done the next day on Tuesday instead of going wednesday. Well my levels on went to 19.89 so the wanted to repeat in two days. Went yesterday an they dropped down to 4.5 so I'm not pregnant anymore. I had another miscarriage. This is my second on this year. I just lo ost a baby b in march at eight an a half weeks.. shortly after my first ultra sound I lost the baby. But didn't have any signs of mc till I was 3 months. An no I Mc this baby too.. I'm so sad an hurt. It's a very hard thing to go threw.. I had to tell my two kids what happened. They have been so excited about me having a baby they have b wanting another brother or sister for awhile now. When I picked them up from school my daughter wanted to know what was wrong an y I was crying. She asked is it the same thing that happened to Avery an I said yes. An both of my kids started balling there eyes out.. they are so sad... it makes me feel like crap.. I feel like I let my kids an SO down. I know why I Mc the first time just not sure what happened this time I was 5wks..