Menstruation. To normal. pls advice.

Hello Me n my husband tried for a baby this month. But i got my periods 6 days post ovulation day as per the app i use "Flo". So i got my periods 8 or 9 days before date. My periods cycle used to be 30 days, then moved to 40 days. Nov 2017 it got crazy, spotting started on the 40th day n went for 2 wks n then i bled for 5 days as usual. I went to gyn that time. Started the thyroid tab in Dec 2017. So post Nov period done, I started getting periods 30 /31 days once. Dec 2017 n Jan 2018 cycle was on time. But Feb 2018 i got my periods way too early. Is it because we tried for a baby or is it normal or should i go to the doc. Pls note for 1yr 3 months i worked in the night shift and thats when my cycle moved from 30 days to 40 days. I quit my job in oct 2017. Now am a home maker n periods were getting back to normal. Pls advice. Thank you.