Test your husband. Could it be your weight - well yes - fat stores estrogen and that can screw with some women but as one of the other posts says - overweight women get pregnant all of the time. I have gained and wonder myself. It is good that you are loosing weight but talk to your doctor.
Well if you've done all the tests and have come back normal then I think it is time for your husband to get tested! Just because there was nothing wrong back then doesn't mean that there isn't anything wrong now. Start charting your temps in the morning, a temperature rise will show whether you are ovulating or not.
I would say unless the doctor specifically told you it was your weight i would have to say no cus my aunt is 300lbs and she has 3 kids bam bam bam!! i think it all depends on the person im smaller i weigh around 130 and im 26 and i can get prego. If the tests came bk normal i would try fertility vitamins like micheals brand or fertil-aid.
Just wanted to add that just because your husband has had children in the past, doesn't necessarily mean things haven't changed since then. You could always have him do a semen analysis, since that is one of the cheapest and least invasive tests a couple can have done. If it's OK, then you can investigate further on your end. What tests have you had done so far?
i have read online about weight...but i have also heard of overweight women getting pregnant
have you talked a doc to see what they recommend?
are you sure you're ovulating? are you timing your intercourse around O time?
there's a number of factors...not just weight that could be an issue
best of luck to you