TTC stress, weird uterus 😱

I have a lot of stress in my life not just now but always, would that cause problems conceiving? Also I have a heart shaped uterus? Which I have no clue what that means for TTC.? Anyone have any advice? Also my last monthly lasted 3 days and was basically non existent and i usually have a very heavy periods that last 5-7 days. I thought I might be prego but took 2 test and both neg. Now I'm awaiting my next. Curious to why it's so lite? Anyone have thoughts on any of this? Please some one give me advice or an answer.