Now just weight

So AF came last night. The pain is continuing but I popped the Midol and all is good. When I went to the doctors office for my vitals the nurse decided to add to my pain having me step on the scale... yea my weight is also an issue. Big surprise, Ok so I'll be giving out numbers. when I met my husband I was 120, 5 yrs later jumped to 125-130,another 6 yrs later started at 130,got pregnant, after baby 135. 2 yrs past jumped to 140 and now current yr last time i weighed myself I was 145, doctors office 155. Ok this weight is moving up fats,I mean fast. So I decided Im going to start exercise and try to eat better of course. My end goal to be at 130 again. that means losing 25lbs, question is in how long till I get pregnant, well if I can keep this up then it's a good thing cause then I can continue to stay fit while pregnant, and if I succeed then of course losing weight will be paused but staying fit will be a challenge. I refuse to gain any more weight, Im only 5'1-5'2 so there's no reason to not be able to do this, wish me luck, I start tomorrow.