2+years TTC

I just want someone to talk to. Someone who has been in my shoes before. Someone to listen and give advice and who can give me hope. My boyfriend and I have been TTC for 2 1/2 years now. I have a 6 year old daughter from a previous relationship and he has 2 boys 13 and 15 from a previous relationship. When I got pregnant with my daughter I weighed only 140 lbs. I currently weight 230. I am determined that it has to do with my weight. I’m only 26 and he is 36. I have nothing else wrong me. I don’t smoke, hardly drink. I’ve tried taken fertility pills from the drug store. I went to the doctor and got a couple tests done. All came back normal. Not sure what else to do. My periods are always regular. Almost every time is the exact date. I take ovulation tests and have sex everyday for the whole week. Anyone have any suggestions? Please help.