I think I'm pregnant but was on birth control pills

Well, I am 22. And live in Thailand. I'm half british-thai and my boyfriend is american- thai. This is my first post i just joined Glow today. So I had an abortion 2 almost 3 months ago because of health issues with the pregnancy. I have been on birth control pills ever since and now all the syptoms i had when i was pregnant is back. I'm moody, very sensitive, boobs are sore and swallen,  i am bloated and i have nausea bad like last time i was pregnant but i just had my period but it was very light and only lasted for 3 day. So i suspect it is probable spotting. If i am pregnant this time me and my boyfriend are keeping the baby. 
My boyfriend is sure i am pregnant but we took a stick pregnancy test the one u pee on and it came up negative. But last time i was pregnant it took a month of pregnancy before it even showed positive.
Just want to know if there is anyone else that has had an abortion and got pregnant as quick as me or if u have any of the same symtoms as me.. Thanks