Testing to early

Hi everyone I am new to this , my little girl was born sleeping in February at 20 weeks and me and my partner wanted to try again quickly this is our first month of trying and I am due on on Monday but I have tested today and it was negative :( I know I shouldn't let it get me down but I can't help thinking that it hasn't worked this month, roll on Monday to see if my time of the month greets me. Apologies for such a long post, hope others are having more luck than me xx