Thanks for the query.
Fluctuations in the menstrual flow are common. That can occur due to many causes like life style modifications, hormonal
Just by symptoms we cannot come to one conclusion regarding pregnancy
You wait till your expected date of periods.
If you miss the periods, wait for one more week and then go for pregnancy test.
This will help in getting accurate result.
Start taking folic acid
tablets from nowonwards.
For more details you can ask me directly through the premium forum.