Longer than normal period

First of all, my husband and I are ttc. Could that have something to do with my weird period this month?

My whole life my period has been 3 days, then it goes away.

today is day 5 and I just started bleeding again! It slowed down on Monday (3rd day like normal) and yesterday was some faint blood, brown in the morning and a little red later in the day but only when I wiped.

Today, I’m full on bleeding again and I just went to the bathroom and there was a big CLOT of blood on my toilet paper! I’m getting concerned. It’s now over 5 days since my period started and it’s never lasted this long. I’ve also NEVER had a clot before! Should I be worried??