I’ve read some threads with women in similar situations and I’m really in need of some advice from people who are (or have been) in the same or similar position as I just feel extremely emotional atm and not sure what to do! 
I’m 23 and have found out I’m 6weeks pregnant by my ex. I was on the depo injection and had a very short break from it which I’m going to guess is when I’ve conceived. I’ve known him for over 7 years and we were together for nearly 3 years but broke up last feb because of some infidelities. We have been trying to work past the issues caused since and have remained close but not in a relationship. Though the whole situation and our relationship feels more complex than what meets the eye. He has twins from a previous relationship and he’s talked before about how him and his ex’s relationship dramatically changed once they had their kids and ultimately led to break up.
He had always said he wants kids with me but also shared his concerns about having a baby in the future with me in case it changed our dynamic and in a sense, we lost each other. I’ve always reassured him that wouldn’t be the case but now we are being faced with pregnancy - it doesn’t seem like it’s something he’s 100% into though he’s said he will support me no matter what. He has voiced that going ahead with the pregnancy will change a lot, both in our own independent lives but also together & he isn’t sure it’s the right time so has suggested I abort.
I’ve always taken precautions with contraception so this was a genuine error on my part for breaking and now I’m faced with the ‘consequences’. I always thought I would abort a baby if both myself and partner were not 100% about it, but now I’m in the position an abortion doesn’t feel like something I want to do. I’m not sure if he feels how he does because he already has 2 kids or because of me.
I’ve always dreamed of having kids and doing so young, e.g early 20s so this somewhat feels like it’s meant to be but I’m just so unsure of what the ‘right thing’ to do is.
Do I try and speak with my ex again or is it this solely my decision if I decide to go ahead with the pregnancy? Also how long should I give myself to make a decision? I’ve only known I’m pregnant for a week but feel pressured (not by anybody but myself tbh) to decide if I’m going to go ahead with the pregnancy.
Also my boobs feel like stone rocks and hurt a lot when I take my bra off on a night - is this normal!? 
Would really appreciate any advice xxx