Another period, another reminder I'm not pregnant.

I've got nowhere else to post this. Facebook and Instagram is overrun with opinionated friends and family.
I started my period tonight. My husband and I have been trying for a few months now. I'm still nursing my 18 month old so I know it could messing with my ovulation. I start full time school in August, pre-nursing, and we are tight on money. It's not the best time for a baby, but it wasn't a great time for my firstborn either and everything worked out.
I'm just trying not to cry. I feel so defeated. I got pregnant the first time with my daughter and now it's so difficult.