Help! concerned 😢

So I had my son on Aug 2nd via c-section. I've been bleed off and on during the first month just as I should because I just had a baby, right? I've been breastfeeding this whole time (Not exclusively, but the majority of the time). Finally, the last week of August, I stopped bleeding. Then I came on September 7th for about 5 days. After that, there were no periods whatsoever. On Nov 17th (couple days ago) I got my period, but this one is really heavy. my baby just started sleeping through the night so he's not getting up for that 1 feeding. I've been taking fenugreek for the past 3 days (4 capsules, 3 times a day) to help with my milk supply (Don't know if it has to do with the heavy bleeding). Anyways this is day 3 and it's still heavy! I can't even sit on the toilet quickly without it pouring onto the seat. I don't use protection, I'm married And we go with the flow. could it be possible that I'm pregnant and miscarrying since I didn't have my period for 2 months? or has this happened to a breastfeeding mama before?