Help First time TTC

Stacie • Engaged. 💍 Stay at home mom 5 year old son due any day now with #2

So my cycles are irregular.

Use to be 28 days but since after deposit it's been from 20-37 days. So help app is basing off 28 days and then last night after sex I was having spotting stopped this morning. I've been getting Moody and I'm extremely tired all day and my boobs hurt / tender