In general, you are UNLIKELY to conceive while on your period.
How long is your cycle? How far apart are your periods, approximately?
Most women have about a 28 day cycle. Day 1 is when the period starts. They normally will ovulate sometime between days 11 and 16. You'd likely "peak" between May 3rd to the 8th. The fertile window would be between April 28 and May 10th - but it ALL depends upon EXACTLY when you ovulate.
Sperm is viable for up to about 5 days. The egg, two days after ovulation.
It's too early to test now. You need to wait at least two weeks or until you'd expect your period.
Hope it helps.
I understand that it is difficult to tell when you are ovulating, especially if you are irregular. Without knowing exactly when you do ovulate we can only guess as to if you can get pregnant. You can monitor your cervical mucous, use body basal temp charting, or ovulating test kits to determine when you do ovulate.
In general, with a 5 day period, it would be unlikely for you to get pregnant having sex during your period - again "IN GENERAL." I'm not saying it can't happen. Sperm can survive up to about 5 days so there is a chance.
With your irregular periods you might consider using a daily birth control pill. A common side effect of using them is that you tend to become more "regular."