month 3.

I want to start out by saying I know alot of you women have been TTC for months and months on end and haven't yet and I'm so sorry for that. me and my husband have a 2 and a half year old daughther and she is absolutely perfect. we feel like now is the time to grow our family , and nothing seems to be sticking. When we had gotten pregnant with our daughther back in 2015 , it was a one time thing where he didnt pull out. and now he never does and I'm not understanding how it isn't working. hes 27 and I'm 23 . I know me worrying every month and tracking my periods, my ovulation, the small window we have to conceive isn't a good thing but I'm honestly upset every month I see the negative or not pregnant across the test. as are all of us. my periods are strange because they go backwards. ( let me explain) a few months ago my start date for my period was the 23rd. well the next month was the 19th, then the 15th then the 13th. last month it was the 10th and I just started yesterday the 8th. now that the dates are getting closer together it should stay on the 8th or 7th for the next few months until it decides to move back again. I feel like with them moving as frequently has they've been that we aren't getting pregnant due to my ovulation window being all over the place. I need someones opinion please.....