I need some advice!!

Leyann • TTC no1: 06/15🤰fell 31/12/16 -> Daughter 08/09/17👶🏻TTC no2: 12/19🤰fell 04/02/21 - lost 31/4/21 👼 fell 13/08/21🙏
Hi I posted the other day but had no response. 
So my period is normally 28-30 days for 4-5 days long. This month o came on on 24th day and lasted 2-3 days, (dark & pad needed sorry tmi) 
So now I'm off I'm getting my period pains/cramping & ive come down with a horrible cold..
I did ovulation test as I get these pains when I'm ovulating I had a line but wasn't as dark as the test line.
I had my first step of fertility testing Monday.. does anyone know why I'm getting these pains now after my period?????