Did I conceive?

My period always lasts for a whole week every month. This month, it lasted for three days and it was bright red and watery looking; almost like really clear discharge and bright red blood. Then, after it ended on the third day, it started back up two days later then stopped again. I've been having chest pains and I'm gassy/constipated. I haven't been feeling well and I don't know if that's because of stress or because of something going on. Please let me know if you guys have any information of what might be going on. Thank you.