The first trimester can be hard...the tiredness, hormones, morning sickness and dealing with a baby can be testing but it sounds like you have a very supportive DH which helps a lot.
My closest gap is 11mths between my two younger girls and that was exhausting (and the fact i had 5 others)...and 13mths between my last two.
My two eldest are 17mths apart and I have found that my favourite age gap.
Good luck with TTC I hope it happens quickly for you...a close gap is fun and rewarding.