The same thing happen to me I had my first at 17 then my second at 19 then 4 months later pregnant with my 3. It's gets easier now I'm 6weeks pregnant with #7 and I'm 30. They all have the same father we been together almost.17 years.
relax and enjoy it you will soon get used to it, 2 close together is a good thing , they will be chums .just relax and all will be well ,don't let anyone pursuede you otherwise . Congrats on the other baby hope he/she is doing well ..lucky you wish I was having another .
Is there a Distress hotline you can call?